4Reynolds F. Labour analgesia and the baby:Good news is no news[J]. Int J Obster Anesth, 2011,20( 1 ) : 38-50.
5Haque R,Umstead TM,Ponnuru P,et al. Role of surfac- rant protein-A (SP-A) in lung injury in response to acute ozone exposure of SP-A deficient mice[J]. T-oxic01 Appl Pharmacol, 2007,220( 1 ) :72-82.
6Lukasse M,Vangen S,Oian P,et al. Feat of childbirth, women's preference for cesarean section and chidhood abuse:a longitudinal study[J]. Acta Obster Gynecol Scand, 2011,90(1) : 33-40.
7Schytt E,Halvarsson A,Pedersen-Draper C,et al. Incom- pleteness of Swedish local clinical guidelines for acupunc ture treatment during childbirth[J]. Acta Obster Gynecol Scand, 2011,90( 1 ) :77-82.
8Sapkota S, Kobayashi T,Takase M. Husbands' experiences of supporting their wives during childbirth in Nepal [J]. Midwifery, 2012,28 ( 1 ) : 45 -51.
9Wegnelius G, Hammarstrom M. Complete rupture of anal sphincter in primiparas:long-term effects and subsequent delivery[J]. Acta Obstet Gynecol Scand,2011,90(3) :258- 263.
10Petersen A,Ayerle G M,Fromke C,et al. The timing of interventions during labour.descriptive results of a longi-tudinal study[J]. Midwifery,2011,27(6) :267-273.