1. From the Department of Epidemiology and Biostatistics (A.R.C., E.M.B., C.M.D., M.L.B., L.-A.M.), School of Public Health, University at Albany, Rensselaer, NY; Congenital Malformations Registry (A.R.C., C.M.D., M.L.B.), New York State Department of Health, Troy; Slone Epidemiology Center (M.M.W., A.A.M.), Boston University, Mass; Genetics Unit (A.E.L.), MassGeneral Hospital for Children, Boston; Department of Epidemiology (P.A.R.), College of Public Health, University of Iowa, Iowa City; and the...