1. Department of Internal Medicine, Guri Hospital, College of Medicine, Hanyang University, 153, Gyeongchun-ro, Guri-si, Gyeonggi-do 11923, Republic of Korea
2. Department of Internal Medicine, CHA Bundang Medical Center, CHA University School of Medicine, 59, Yatap-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 13496, Republic of Korea
3. Department of Statistics and Actuarial Science, Soongsil University, 369, Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea
4. Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29, Saemunan-ro, Jongno-gu, Seoul 03181, Republic of Korea