1. Department of Internal Medicine, Incheon St. Mary’s Hospital, The Catholic University of Korea, Incheon, Korea
2. Department of Internal Medicine, Daejeon St. Mary’s Hospital, The Catholic University of Korea, Daejeon, Korea
3. Department of Internal Medicine, Bucheon St. Mary’s Hospital, The Catholic University of Korea, Bucheon, Korea
4. Department of Internal Medicine, Uijeongbu St. Mary’s Hospital, The Catholic University of Korea, Uijeongbu, Korea
5. Department of Internal Medicine, St. Vincent’s Hospital, The Catholic University of Korea, Suwon, Korea
6. Department of Internal Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea