1. Health and Human Development Section Division for Operations, United Nations Office on Drugs and Crime, Vienna, Austria
2. Department of Psychiatry, Vincent P. Dole Dual Diagnosis Unit, University of Pisa, Pisa, Italy
3. Addiction Treatment Service, Pisa, Toscana, Italy
4. Addiction Treatment Service, Biella, Piemonte, Italy
5. Division on Substance Abuse, Columbia University/New York State Psychiatric Institute, New York, New York, USA