1. Department of Biostatistics, School of Public Health, University of Ghana, Legon, Accra, Ghana
2. International Consultant, Harm Reduction and Key Population Expert, Lisbon, Portugal
3. West Africa Program to Combat AIDS, Accra, Ghana
4. National AIDS/STI Control Programme, Ghana Health Service, Accra, Ghana
5. International Drug Policy Consortium, East Legon, Accra, Ghana
6. West Africa Behavioural Health Addictions and Recovery Management, Accra, Ghana
7. Department of Population Family and Reproductive Health School of Public Health, University of Ghana, Legon, Accra, Ghana