Committee on Medicare Coverage Extensions, Division of Health Care Services ; Field, Marilyn Jane ; Lawrence, Robert S. ; Marilyn J. Field, Robert L. Lawrence, and Lee Zwanziger ; Zwanziger, Lee ; Lawrence, Robert ; Lee Zwanziger ; Marilyn J. Field ; Robert L. Lawrence ; Committee on Medicare Coverage Extensions ; Division of Health Care Services ; Field, Marilyn J. ; Lawrence, Robert L. ; Zwanziger, Lee L. ; Institute of Medicine (U.S.)