1. From the Centers for Medicare and Medicaid Services (R.R., A.P., K.M., J.D.B., P.H.C.), the Maryland Health Services Cost Review Commission (J.M.C.), Johns Hopkins Medicine (J.M.C.), and the Maryland Department of Health and Mental Hygiene (J.M.S.) — all in Baltimore; Brigham and Women's Hospital, Boston (R.R.); and Cincinnati Children's Hospital Medical Center, Cincinnati (P.H.C.).