ELBW	extremely low birth weight;
RDS	respiratory distress syndrome;
BPD	bronchopulmonary dysplasia;
PPHN	persistent pulmonary hypertension of the newborn;
IVH	intraventricular hemorrhage;
NEC	necrotizing enterocolitis;
PDA	patent ductus arteriosus;
ROP	retinopathy of prematurity;
CPR	cardiopulmonary resuscitation;
ICD	intercostal drainage;
PRC	packed red cell.