6Delke I,Minkoff H,Grunebaum A. Effect of Lamaze childbirth preparation on maternal plasma beta-endorphin immunoreactivity in active labor[J]. American Journal of Perinatology, 1985,2(4):317-319.
7Rowbottom SJ,Ctitehley LA,Gn T. Uterint rupture and epidural analgesin dunring trial of labour. Anaesthesina[J],1997,52(5):486.
