1. Department of Preventive Medicine, College of Medicine Catholic University of Korea Seoul South Korea
2. Department of Psychiatry, College of Medicine Catholic University of Korea Seoul South Korea
3. Departments of Psychiatry, Neuroscience and Child Study Center Yale University New Haven CT USA
4. Connecticut Council on Problem Gambling Wethersfield CT USA
5. Connecticut Mental Health Center New Haven CT USA
6. Department of Biostatistics, Clinical Research Coordinating Center The Catholic University of Korea Seoul South Korea