1. Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts (S.P.J., K.J.M.)
2. University of Massachusetts Medical School, Worcester, Massachusetts (L.C.K.)
3. The Johns Hopkins University School of Medicine, The Johns Hopkins Bloomberg School of Public Health, and The Welch Center for Prevention, Epidemiology and Clinical Research, Baltimore, Maryland (L.J.A., E.R.M.)
4. Harvard T.H. Chan School of Public Health, Harvard Medical School, Brigham and Women's Hospital, Boston, Massachusetts (F.M.S.)
5. University of Maryland School of Medicine, Baltimore, Maryland (R.H.C., H.R.)
6. Geisinger Health System, Danville, Pennsylvania (A.R.C.)