1. Epidemiology & Biostatistics Division, Department of Community Medicine, Faculty of Clinical Sciences, College of Health Sciences, Bayero University, Kano, Nigeria
2. Obstetrics and Gynecology, Bayero University, Kano, Nigeria
3. School of Medicine, University of Kentucky, Lexington, KY, United States
4. Department of Family and Community Medicine, Baylor College of Medicine, Houston, Texas, United States
5. Department of Health Policy and Vanderbilt Institute for Global Health,Vanderbilt University Medical Center, Tennessee, United States