1Heinzmarm A,Brugger M,Engels C,et al.Risk factors of neonatal respiratory distress following vaginal delivery and caesarean section in the German population[J].Acta Paediatr,2009,98(1):25-30.
6Cleary-Goldman J, Malone FD, Vidaver J, et al. Impact of mater- nal age on obstetric outcome. Obstet Gynecol, 2005,105 (51): 983 -990.
7Heinzmarm A, Brugger M, Engels C, et al. Risk factors of neonatal respiratory distress following vaginal delivery and caesarean section in the German population. Acta Paediatr, 2009,98( 1 ) : 25-30.