1. Affiliate of Cochrane, US, Department of Public Health and Community Medicine, Tufts University School of Medicine, Boston, MA, USA
2. Department of Public Health and Community Medicine, Tufts University School of Medicine, Boston, MA, USA
3. School of Medicine, Tufts University School of Medicine, Boston, MA, USA
4. Department of Sexual and Reproductive Health and Research, World Health Organization, Geneva, Switzerland