Obstetric transition: the pathway towards ending preventable maternal deaths - Souza, João Paulo Dias de; Tunçalp, Ö; Vogel, J. P; Bohren, M.; Widmer, M; Oladapo, O. T; Say, L.; Gülmezoglu, A. M; Temmerman, M (BJOG - An International Journal of Obstetrics and Gynaecology, 2014)