Affiliation: | 1. Epidemiology Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), Rockville, Md;2. Division of Epidemiology, Statistics, and Prevention Research (DESPR), Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), Rockville, Md;3. Pregnancy and Perinatology Branch, NICHD, Rockville, Md;4. Bioinformatics and Biostatistics Branch, DESPR, NICHD, Rockville, Md |