title: In reply.
authors.affiliation: Social, Statistical, and Environmental Sciences Unit, RTI International, Rockville, Maryland.
authors.forename: Abhik
authors.initials: A
authors.lastname: Das
authors.affiliation: Social, Statistical, and Environmental Sciences Unit, RTI International, Research Triangle Park, North Carolina.
authors.forename: Shampa
authors.initials: S
authors.lastname: Saha
authors.affiliation: Department of Pediatrics, University of Iowa, Iowa City.
authors.forename: Frank H
authors.initials: FH
authors.lastname: Morriss
mesh_terms: D002658:Developmental Disabilities / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007232:Infant, Newborn, Diseases / Q000601:surgery*; D019102:Infant, Very Low Birth Weight; D008297:Male; D009422:Nervous System Diseases / Q000453:epidemiology*