1. Department of Psychiatry, College of Medicine, Cheju National University, #1 Ara-1 dong Jeju, jeju-do, 690–756, Korea.
2. Department of Preventive Medicine, College of Medicine, Cheju National University, Jeju, Korea.
3. Department of Psychiatry, College of Medicine, Cheju National University, Jeju, Korea.
4. Department of Family Practice, College of Medicine, Cheju National University, Jeju, Korea.
5. Department of Veterinary Medicine, College of Agriculture and Life Sciences, Cheju National University, Jeju, Korea.
6. Department of Rehabilitation Medicine, College of Medicine, Cheju National University, Jeju, Korea.