1. Harvard Medical School, Harvard Pilgrim Health Care Institute, and Brigham and Women's Hospital, Boston, Massachusetts (M.K., M.A.B., C.R.)
2. Brigham and Women's Hospital, Boston, Massachusetts (R.T., K.F., D.G., C.B., H.S., N.W., E.G., A.R., M.P., K.B., J.S., C.A.M.)
3. Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts (R.W.)
4. Massachusetts Department of Public Health, Boston, Massachusetts (G.R.G., A.S.L., T.F., S.B., S.S., L.M.)