1. University Health Services, University of Ibadan, Ibadan, Nigeria
2. Division of Psychiatry, Imperial College London, London, United Kingdom
3. CAMHS, Surrey and Borders Partnership NHS Foundation Trust, Surrey, United Kingdom
4. Centre for Child and Adolescent Mental Health, University of Ibadan, Ibadan, Nigeria
5. Drug Abuse Treatment Education and Research Unit, Federal Neuro-Psychiatric Hospital, Benin City, Nigeria