Reduction of mortality in the premature nursery.  II.  Incidence and causes of prematurity; ethnic, socioeconomic and obstetric factors.
D005006:Ethnicity; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D007234:Infant, Premature; D009724:Nurseries, Infant; D011247:Pregnancy
INFANT, PREMATURE