1. Center for Social Development and Information (Population Services International/Russia), 125315 Moscow, Russia
2. Institute for Public Health and Health Management, First Moscow State Medical University, 119021 Moscow, Russia
3. Division of Pharmacologic Therapies, Center for Substance Abuse Treatment, Substance Abuse and Mental Health Services Administration, Rockville, MD 20857, USA
4. Division for Anti-Drug Work Coordination, Cabinet of Ministers of the Republic of Tatarstan, Kazan, 420060 Republic of Tatarstan, Russia
5. Public Organization “Prevention and Initiative”, Kazan, 420044 Republic of Tatarstan, Russia
6. Republican Drug Treatment Hospital, Kazan, 420082 Republic of Tatarstan, Russia