Wellings Kaye, Johnson Anne M
Centre for Sexual and Reproductive Health Research, Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London WC1H 9SH, UK.
Lancet. 2013 Nov 30;382(9907):1759-62. doi: 10.1016/S0140-6736(13)62378-8. Epub 2013 Nov 26.