1. Department of Internal Medicine, Eulji Medical Center, Eulji University, Seoul 01830, Republic of Korea
2. Department of Surgery, Eulji Medical Center, Eulji University, Seoul 01830, Republic of Korea
3. Department of Internal Medicine, Seoul National University Hospital, Seoul 03080, Republic of Korea
4. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang-si, Gyeonggi-do 10380, Republic of Korea