Yap-Seng Chong1, Lin-Lin Su. 1. Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore and National University Hospital, Singapore 119074. obgcys@nus.edu.sg
Authors: G Justus Hofmeyr; A Metin Gülmezoglu; Natalia Novikova; Verena Linder; Sandra Ferreira; Gilda Piaggio Journal: Bull World Health Organ Date: 2009-09 Impact factor: 9.408