Surgery in very low birthweight infants.
D000013:Congenital Abnormalities / Q000601:surgery; D004374:Ductus Arteriosus, Patent / Q000601:surgery; D004761:Enterocolitis, Pseudomembranous / Q000601:surgery; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D013514:Surgical Procedures, Operative / Q000401:mortality; D013997:Time Factors