title: The Johns Hopkins Collaborative Perinatal Project. A symposium. Introduction.
mesh_terms: D001289:Attention Deficit Disorder with Hyperactivity; D001925:Brain Damage, Chronic; D002657:Child Development; D005260:Female; D006784:Hospitals, Teaching; D006801:Humans; D008396:Maryland; D011247:Pregnancy; D011446:Prospective Studies