1. Department of Psychiatry, Ankara Numune Training and Research Hospital, Ankara, Turkey
2. Department of Psychiatry, Medical Faculty, Başkent University, Ankara, Turkey
3. Department of Psychology, Hasan Kalyoncu University, Gaziantep, Turkey
4. Department of Psychiatry, University of Texas Medical School of Houston, Houston, TX, USA
5. Center for Neurobehavioral Research on Addictions, Houston, TX, USA
6. Ankara, Turkey
7. Department of Psychiatry, Medical Faculty, Ankara University, Ankara, Turkey
8. Department of Biostatistics, Medical Faculty, Uludag University, Bursa, Turkey