[Strategic view of perinatal care in different birth weight groups].
D001238:Asphyxia Neonatorum / Q000401:mortality; D006801:Humans; D007226:Infant Mortality; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007234:Infant, Premature; D007236:Infant, Small for Gestational Age; D012127:Respiratory Distress Syndrome, Newborn / Q000401:mortality; D012593:Sclerema Neonatorum / Q000401:mortality