1. AMSURG Corp.
2. Aquity LLC
3. Aspen Healthcare
4. CityMD
5. Community Health Systems Inc.
6. DaVita Inc.
7. Envision Physician Services
8. FastMed Urgent Care
9. Fresenius Kabi AG
10. HCA Healthcare
11. Healthway Medical Group
12. LifePoint Health Inc.
13. Medical Facilities Corporation
14. Pediatrix Medical Group
15. PYA
P.C.
16. Select Medical Corporation
17. Sonic Healthcare Limited
18. Surgery Partners
19. Symbion Pty Ltd.
20. Terveystalo Healthcare
21. Universal Health Services Inc.