1. Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts (R.D., M.C.C., J.Z.L.)
2. Harvard T.H. Chan School of Public Health, Boston, Massachusetts (C.M., J.R., M.D.H.)
3. Lundquist Institute at Harbor–University of California, Los Angeles Medical Center, Torrance, California (E.S.D.)
4. University of North Carolina, Chapel Hill, North Carolina (D.A.W., J.J.E.)
5. University of Washington Medical Center, Seattle, Washington (A.L.G.)
6. David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California (J.S.C., K.W.C.)
7. University of California, San Diego, San Diego, California (D.M.S.).