CRF	case report form
ETI	endotracheal tube intubation
PPV	positive pressure ventilation
HIE	hypoxic ischemic encephalopathy
HIC	high income countries
LIC	low income countries
LMIC	low-middle income countries
UN	United Nations
WHO	World Health Organization
VNCH	Vietnam National Children’s Hospital
NBW	normal birth weight
LBW	low birth weight
VLBW	very low birth weight
ELBW	extremely low birth weight
RDS	respiratory distress syndrome
PROM	prolonged (≥18 h) rupture of membranes