1. Centre for Research and Information on Substance Abuse, Uyo, Nigeria
2. International Blue Cross, Nigeria
3. Institute for Therapy and Health Research, Kiel, Germany
4. Department of Sociology and Anthropology, Nnamdi Azikiwe University, Awka, Nigeria
5. Department of Psychology, University of Ibadan, Ibadan, Nigeria
6. Department of Psychology, College of Arts, Management and Social Sciences, Chrisland University, Abeokuta Nigeria