1. Department of Internal Medicine, Dongguk University College of Medicine, Gyeongju, Korea.
2. Department of Preventive Medicine, Dongguk University College of Medicine, Gyeongju, Korea.
3. Department of Internal Medicine, Andong Medical Center, Andong, Korea.
4. Department of General Surgery, Andong Medical Center, Andong, Korea.
5. Department of Pediatrics, Dongguk University College of Medicine, Gyeongju, Korea.