Kyung-Eun Lee1, Shin-Seok Lee2. 1. Department of Rheumatology, Chonnam National University Medical School and Hospital, 42 Jebong-ro, Dong-gu, Gwangju, 61469, Republic of Korea. 2. Department of Rheumatology, Chonnam National University Medical School and Hospital, 42 Jebong-ro, Dong-gu, Gwangju, 61469, Republic of Korea. shinseok@chonnam.ac.kr.