
Does sympathetic activity contribute to growth of preterm infants?
Keywords: BW، وزن تولد; BW, Birth weight; GA, Gestational age; HR, Heart rate; MDHR, Mean daily heart rate during whole hospitalization; MDHR3, Mean daily heart rate during days 1–3 of life; MDHR4, Mean daily heart rate from the 4th day of life to discharge from hospital; NICU,