3Sandall J, Devane D, Sohani H,et al. Improving quality and safety in maternity care: the contribution of mid wife led care[J].J Midwifery Womens Health, 2010,5,5 (3) :255-261.
4Rooks J P. The midwifery model of care[J]. J Nurse Midwifery, 1999,44(4):370-374.
5Sandll J, Haleru M, Devane D, et al. Discussions of fin dings from a Cochrane review of midwife-led versus other models of care for childbearing women:continuity, normality and safety[J]. Midwifery,2009,25( 1 ) :8-13.
6Taavoni S, Abdolahian S, Haghani H, et al. Effect of birth ball usage on pain in the active phase of labor: a randomized controlled trial[J]. J Midwifery Womens Heahh,2011,56(2) : 137-140.
7Hutton E K, Hassan E S. Irate vs early clamping of the umbilical cord in full term neonates., systematic review and meta-analysis of controlled trials[J]. JAMA,2007, 297(11) :12,11-1252.
8Mercer J S. Current best evidence: a review of the litera ture on umbilical cord clamping[J]. J Midwifery Womens Health,2001,46(6):102-414.
9Chaparro C M, Fornes R, Neufeld I. M, et al. Early umbilical cord clamping contributes to elevated hlood lead levels among infants with higher lead exposure[J]. J Pediatr,2007,151 (5) :506-512.