Trends in severe bronchopulmonary dysplasia rates between 1994 and 2002
Keywords: سن حاملگی; BPD; Bronchopulmonary dysplasia; GA; Gestational age; NEC; Necrotizing enterocolitis; KPMCP; Kaiser Permanente Medical Care Program; NICU; Neonatal intensive care unit; CMH; Cochran-Mantel-Haenszel; VLBW; Very low birth weight; CPAP; Continuous positive a