1. CIET Trust Botswana, Gaborone, Botswana
2. CIET/PRAM, Department of Family Medicine, McGill University, Montreal, QC, Canada
3. National AIDS Coordinating Agency, Gaborone, Botswana
4. Centro de Investigacion de Enfermedades Tropicales (CIET), Universidad Autonoma de Guerrero, Acapulco, Guerrero, Mexico