1. Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta GA
2. UNDP-UNFPA-UNICEF-WHO-World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Sexual and Reproductive Health and Research, World Health Organization, Geneva, Switzerland
3. Department of Biostatistics and Epidemiology, University of Massachusetts Amherst, Amherst, MA