Chong Hong Lim1,2, Ching-Tsai Lin2, Yi-Hsing Chen2,3. 1. Rheumatology Unit, Department of Internal Medicine, Pulau Pinang General Hospital, Georgetown, Malaysia. 2. Division of Allergy, Immunology and Rheumatology, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan. 3. School of Medicine, National Yang-Ming University, Taipei, Taiwan.