1. Department of Health Behavior and Health Education, University of Michigan School of Public Health, Ann Arbor, Michigan, USA
2. School of Public Health, University of Ghana, Legon, Ghana
3. Department of Obstetrics and Gynecology, Komfo Anokye Teaching Hospital, Kumasi, Ghana
4. Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, Michigan, USA