Active management of the third stage of labour with and without controlled cord traction: a randomised, controlled, non-inferiority trial. - Gülmezoglu AM; Lumbiganon P; Landoulsi S; Widmer M; Abdel-Aleem H; Festin M; Carroli G; Qureshi Z; Souza JP; Bergel E; Piaggio G; Goudar SS; et al. (Lancet, 2012)