1. Department of Obstetrics and GynecologyUniversity of Michigan Ann Arbor MI USA
2. Department of Epidemiology and BiostatisticsIndiana University Bloomington IN USA
3. Department of Community HealthCollege of Health SciencesUniversity of Ghana Accra Ghana
4. Department of Epidemiology and BiostatisticsKwame Nkrumah University of Science and Technology Ashanti Ghana