title: Infant morbidity: a measurement of severity and occurrence of illness in preterm and term infants.
authors: J M
authors: JM
authors: Urtis
authors: D
authors: D
authors: Clayton
authors: S S
authors: SS
authors: Jay
mesh_terms: D000328:Adult; D003710:Demography; D005260:Female; D005865:Gestational Age; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007234:Infant, Premature; D008423:Maternal Age; D009017:Morbidity; D011247:Pregnancy; D014481:United States