Current status of the National Children's Study.
Hirschfeld
Steven
S
National Children's Health Study, NICHD, NIH, Bethesda, MD 28014, USA. hirschfs@mail.nih.gov
Kramer
Barnett
B
Guttmacher
Alan
A
D002648:Child; D006306:Health Surveys / Q000379:methods / Q000592:standards; D006801:Humans; D014481:United States