V. Pingray,M. Widmer,A. Ciapponi,G. J. Hofmeyr,C. Deneux,M. Gülmezoglu,K. Bloemenkamp,O. T. Oladapo,D. Comandé,A. Bardach,P. Vázquez,G. Cormick and F. Althabe. Effectiveness of uterine tamponade devices for refractory postpartum haemorrhage after vaginal birth: a systematic review. Bjog. 2021;128(11):10.1111/1471-0528.16819.