1. PhD Candidate, London School of Economics and Political Science, London, UK. Correspondence:
2. Professor of Health and International Development, London School of Economics and Political Science, London, UK
3. Assistant Professorial Research Fellow, London School of Economics and Political Science, London, UK
4. Principal Research Scientist, Guttmacher Institute, New York, NY, USA
5. Associate Professor, College of Public Health, Ohio State University, Columbus, OH, USA
6. Senior Global Director, MNCH/FP, IntraHealth International, Chapel Hill, NC, USA
7. Professor, Department of Obstetrics, Gynecology and Reproductive Sciences, Advancing New Standards in Reproductive Health (ANSIRH), University of California San Francisco, Oakland, CA, USA