1. Centre for Microbiology Research, Kenya Medical Research Institute, Nairobi, Kenya
2. Department of Health Behavior and Health Education, University of Michigan, Michigan, USA
3. Health Studies, Center for Interdisciplinary Studies, College of the Holy Cross, Worcester, Massachusetts, USA
4. Department of Community Health, Jomo Kenyatta University of Agriculture and Technology, Thika, Kenya
5. New York State Psychiatric Institute and Columbia University, New York, New York, USA