1. Bureau of International Medical Cooperation, National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo 162-8655, Japan
2. Centre for Non-Communicable Diseases Research, Institute of Health Research, University of Health and Allied Sciences, P.O. Box 31, Ho, Volta Region, Ghana
3. Navrongo Health Research Centre, P.O. Box 114, Navrongo, Upper East Region, Ghana
4. Wa Technical Institute, P.O. Box 238, Wa, Upper West Region, Ghana
5. Department of Biostatistics and Epidemiology, School of Public Health, C.K. Tedam University of Technology and Applied Sciences, P.O. Box 24, Navrongo, Upper East Region, Ghana