1. Department of Health Promotion, Education and Behavior, University of South Carolina, Columbia, USA
2. Population and Quantitative Health Sciences, University of Massachusetts, Boston, USA
3. Department of Psychology, University of Zambia, Lusaka, Zambia
4. Department of Health Service Policy and Management, University of South Carolina, Columbia, USA
5. Department of Health Behavior and Health Education, University of Michigan, Ann Arbor, USA