The incidence, complications and predictors of low birth weight.
D000293:Adolescent; D000328:Adult; D004544:El Salvador; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases; D011247:Pregnancy; D011248:Pregnancy Complications