原文见:Deneux-Tharaux C,Sentilhes L,Maillard F,et al.Effect of routine controlled cord traction as part of the active management of the third stage of labour on postpartum haemorrhage:multicentre randomised controlled trial(TRACOR)[J].BMJ,2013:346.Published at:http://www.bmj.com/content/346/bmj.f1541