Lusti-Narasimhan Manjula, Ndowa Francis, Pires Susana Salgado
Department of Reproductive Health and Research, World Health Organization 20, Avenue Appia CH-1211 Geneva 27, Switzerland.
Sex Transm Infect. 2011 Dec;87 Suppl 2(Suppl 2):ii19-22. doi: 10.1136/sextrans-2011-050183.