Hung-Ling Huang1, Wei-Tsung Wu1, Tsan-Teng Ou2. 1. Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. 2. Division of Rheumatology, Department of Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan. Electronic address: cattyerkmu@gmail.com.