1. Department of Internal Medicine, Cheongju Medical Center, Cheongju, Korea.
2. Department of Health Informatics and Management, College of Medicine, Chungbuk National University, Cheongju, Korea.
3. Department of Applied Mathematics, Kyung Hee University, Yongin, Korea.
4. Armed Forces Medical Command, Seongnam, Korea.
5. Armed Forces Gangneung Hospital, Gangneung, Korea.