1. Institute for Social Marketing and Health, University of Stirling, Stirling, Scotland
2. Department of Health Sciences, University of York, York, UK
3. Advancement through Research and Knowledge Foundation Bangladesh, Dhaka, Bangladesh
4. Division of Epidemiology & Biostatistics, School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa
5. Department of Medicine, University of California, San Francisco, CA, School of Public Health, University of California, Berkeley, CA, USA