1) AMERICAN HOSPITAL ASSOCIATION

2) BAYCARE HEALTH SYSTEM

3) BLUE CROSS BLUE SHIELD OF MASSACHUSETTS

4) BOSTON MEDICAL CENTER

5) CAMBIA HEALTH SOLUTIONS (FORMERLY KNOWN AS THE REGENCE GROUP)

6) CAREFIRST BLUECROSS BLUESHIELD

7) CHILDREN'S HOSPITAL ASSOCIATION F/K/A NAT'L ASSOCIATION OF CHILDREN'S HOSPITALS

8) DAVITA INC.

9) FOUNTAIN HOUSE

10) GE HEALTHCARE

11) GENEDX, LLC

12) GREATER NEW YORK HOSPITAL ASSOCIATION

13) KAROO HEALTH

14) MOUNT SINAI HOSPITALS GROUP, INC

15) PHARMACEUTICAL CARE MANAGEMENT ASSOCIATION (PCMA)

16) QUEST DIAGNOSTICS INCORPORATED

17) THE CIGNA GROUP

18) THE GUARDIAN LIFE INSURANCE COMPANY OF AMERICA