Bibliographical noteFunding Information:
We acknowledge Deborah S. Grove, Director for Genetic Analysis. Genotyping was principally supported by a Research Board grant from the University of Illinois at Urbana-Champaign. The NICHD SECCYD was supported by the Eunice Kennedy Shriver National Institute of Child Health and Human Development, the National Institutes of Health. We express our appreciation to the study coordinators at each site who oversaw the data collection, to the research assistants who collected the data, and especially to the families and children who cooperated so willingly with our longitudinal data collection in both NICHD SECCYD and Generation R cohorts.This research was also supported in part by the research projects PTDC/PSI- PCL/101506/2008 and PTDC/PSI- PCL/116897/2010 from Fundaçãopara a Ciência e Tecnologia (FCT) from Portugal.