1. Vietnam HIV Addiction Technology Transfer Center - University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
2. Faculty of Public Health, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
3. Center for Disease Control and Prevention of Ho Chi Minh City, Ho Chi Minh City, Vietnam
4. National Drug Dependence Treatment Center and Department of Psychiatry, All India Institute of Medical Sciences (AIIMS), New Delhi, India