title: Perinatal studies--No. II. In search of a working definition of perinatal morbidity.
mesh_terms: D000013:Congenital Abnormalities; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000145:classification* / Q000453:epidemiology; D007494:Ireland; D009626:Terminology as Topic