Uterotonic drugs to prevent postpartum haemorrhage: a network meta-analysis oleh Ioannis Gallos, Helen Williams, Malcolm Price, Karen Pickering, Abi Merriel, Aurelio Tobias, David Lissauer, Harry Gee, Özge Tunçalp, Gillian Gyte, Vidhya Moorthy, Tracy Roberts, Jonathan Deeks, Justus Hofmeyr, Metin Gülmezoglu, Arri Coomarasamy