![John Sardelis](https://cdn.zonebourse.com/static/resize/768/576//static/images/insiders/unknown.png)
John Sardelis
Direktor/Vorstandsmitglied bei Island Peer Review Organization, Inc.
Aktive Beziehungen
Name | Geschlecht | Alter | Unternehmensverbindungen | Zusammenarbeit |
---|---|---|---|---|
Anthony Boutin | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Michael Gene Murphy | M | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 7 Jahre |
John Friedman | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Edison A. Machado | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | 13 Jahre |
Lynn D. Sherman | F | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 24 Jahre |
Robert G. Lerner | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Raymond D. Sweeney | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Linda S. Muller | F | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 8 Jahre |
Jean Lobban | M | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | - |
Paul J. Rowland | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Yvette Walker | M | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 21 Jahre |
Brian McIndoe | M | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 7 Jahre |
Stuart Almer | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Russell Caprioli | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
John P. Donnelly | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Soraya Campbell | F | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Jan R. Figueira | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Martin Glennon | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Bobby K. Kalotee | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Jason L Abelove | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
William Shanahan | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Edward Farbenblum | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Paul Provonost | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Nanette Falkenberg | F | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 19 Jahre |
Barbara Breckenridge | F | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Lisa Daniels | F | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Heekyeong Ma | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Renita Peck | F | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Nauman Shahid | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Ajit K. Abraham | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Bruce Allen Chernof | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Giuseppe Caruso | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Verona P. Greenland | F | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 38 Jahre |
James Carmona | M | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | - |
Amy Knapp | F | 68 |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 16 Jahre |
Frank J. Saracino | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Abbe Abboa-Offei | M | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | - |
Theodore O. Will | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Clare B. Bradley | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Harry M. Feder | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Richard A. Alfieri | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Virginia Hill | F | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Paloma Izquierdo-Hernandez | F | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 24 Jahre |
Russel Caprioli | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Lois Wagh | F | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Steve Cohn | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Paul F. Macielak | M | - |
Island Peer Review Organization, Inc.
![]() Island Peer Review Organization, Inc. Hospital/Nursing ManagementHealth Services Island Peer Review Organization, Inc. provides healthcare assessment and improvement services. It ensures medically necessary and appropriate care, promotes value-driven healthcare, and partners with providers to improve care and health outcomes. The company was founded in 1984 and is headquartered in Lake Success, NY. | - |
Victor A. Gallo | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Caleb DesRosiers | M | 51 |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 13 Jahre |
Linda Reed | F | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Warren D. Zysman | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Robert W. Schiller | M | 71 |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 13 Jahre |
Sharon Deans | M | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | - |
Bobby Kalotee | M | - |
Nassau Health Care Corp.
![]() Nassau Health Care Corp. Hospital/Nursing ManagementHealth Services Nassau Health Care Corp. provides health care services. It offers specialized medicine, primary care and wellness, surgical and emergency care, radiology and laboratory services. The company was founded in 1997 and is headquartered in East Meadow, NY. | - |
Beziehungs-Chart
Beziehungen zu mehreren Unternehmen
Ehemalige Beziehungen
Name | Geschlecht | Alter | Unternehmensverbindungen | Zusammenarbeit |
---|---|---|---|---|
Bertram Scott | M | 73 |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 2 Jahre |
Maura Bluestone | F | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 26 Jahre |
James A. Hooley | M | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | - |
Glenn A. MacFarlane | M | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 4 Jahre |
Mark T. Corcoran | M | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | - |
Lisa A. Keehn | F | - |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 3 Jahre |
Scott Breidbart | M | 68 |
Affinity Health Plan, Inc
![]() Affinity Health Plan, Inc Medical/Nursing ServicesHealth Services Affinity Health Plan, Inc. engages in the provision of healthcare services. It offers Medicaid program, Child Health Plus, Essential Plan, and Enriched Health plan. The company was founded by Maura Bluestone in 1986 and is headquartered in Bronx, NY. | 3 Jahre |
Statistik
Land | Beziehungen | % des Gesamten |
---|---|---|
Vereinigte Staaten | 61 | 100,00% |
Alter der Beziehungen
Aktive
Vergangene
Herr
Frau
Aufsichtsräte
Führungskräfte
Ursprung der Beziehungen
- Börse
- Insiders
- John Sardelis
- Persönliches Netzwerk