作者单位:Zeynep Kamil Matern & Childrens Res & Training Ho, Dept Neonatal Intens Care, Istanbul, Turkey[1]Abant Izzet Baysal Univ, Res & Training Hosp, Dept Neonatal Intens Care, Bolu, Turkey[2]Ordu Univ, Res & Training Hosp, Dept Neonatal Intens Care, Ordu, Turkey[3]