1. Department of Internal Medicine, College of Medicine, Chosun University, Gwangju, South Korea.
2. Department of Internal Medicine, Yeungnam University, College of Medicine, Daegu, South Korea.
3. Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, Korea.
4. Department of Infectious Diseases, Seoul Metropolitan Government Seobuk Hospital, Seoul, Korea.
5. Department of Preventive Medicine, College of Medicine, Chosun University, Gwangju, South Korea.
6. Department of Pulmonary and Critical Care Medicine, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
7. Department of Internal Medicine, St. Vincent's Hospital, School of Medicine, The Catholic University of Korea, Seoul, South Korea.
8. Premedical Science, College of Medicine, Chosun University, Gwangju, South Korea.