1. Institute of Statistical, Social and Economic Research (ISSER University of Ghana Accra Ghana
2. Department of Population, Family and Reproductive Health School of Public Health University of Ghana Accra Ghana
3. Department of Medical Microbiology School of Medicine and Dentistry University of Ghana Accra Ghana
4. Department of Surgery Korle Bu Teaching Hospital Accra Ghana
5. Department of Public Health Aarhus University Aarhus Denmark