1. Alpert Medical School of Brown University, Providence, Rhode Island, and University of Toronto and Women's College Hospital, Toronto, Ontario, Canada (A.M.D.)
2. Brown University School of Public Health, Providence, Rhode Island (G.P.A., V.R., A.G., B.S., T.A.T.)
3. Alpert Medical School of Brown University, Providence, Rhode Island (F.M., M.A.W.)