Sun, X., Department of Rheumatology & Immunology, Peking University People's Hospital, 11 Xizhimen South St.Beijing 100044, China; Li, R., Department of Rheumatology & Immunology, Peking University People's Hospital, 11 Xizhimen South St.Beijing 100044, China; Cai, Y., Department of Rheumatology & Immunology, Peking University Shenzhen Hospital, Shenzhen, China; Al-Herz, A., Rheumatology Unit, Department of Internal Medicine, Al-Amiri Hospital, Kuwait City, Kuwait; Lahiri, M., Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Choudhury, M.R., Department of Rheumatology, Bangabandhu Sheikh Mujib Medical UniversityDhaka, Bangladesh; Hidayat, R., Department of Internal Medicine, Cipto Mangunkusumo National Hospital Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia; Suryana, B.P.P., Rheumatology Division, Internal Medicine Department, Brawijaya University - Saiful Anwar Hospital, Indonesia; Kaneko, Y., Division of Rheumatology, Department of Internal Medicine, Keio University School of MedicineTokyo, Japan; Fujio, K., Department of Allergy and Rheumatology, Graduate School of Medicine, The University of TokyoTokyo, Japan; Van Hung, N., Department of Rheumatology, Bach Mai Hospital, Giai Phong Road, Dong Da DistrictHanoi, Viet Nam; Pandya, S., Vedanta institute of medical sciences and VS hospital, Ahmedabad, India; Pang, L.K., Department of Rheumatology, Allergy and Immunology, Tan Tock Seng Hospital, Singapore; Katchamart, W., Division of Rheumatology, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol UniversityBangkok, Thailand; Sigdel, K.R., Department of Internal Medicine, Patan Academy of Health Sciences, Kathmandu, Nepal; Paudyal, B., Department of Internal Medicine, Patan Academy of Health Sciences, Kathmandu, Nepal; Narongroeknawin, P., Division of Rheumatology, Department of Medicine, Phramongkutklao Hospital and College of MedicineBangkok, Thailand; Chevaisrakul, P., Division of Allergy, Immunology and Rheumatology, Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol UniversityBangkok, Thailand; Sun, F., Department of Epidemiology and Biostatistics, School of Public Health, Peking University, 38 Xueyuan Road, Haidian DistrictBeijing 100191, China; Lu, Y., School of Mathematical Science, Nankai University, No. 94 Weijin Road, Nankai DistrictTianjin 300071, China; Ho, C., Division of Rheumatology, Dept of Medicine, The University of Hong Kong, Hong Kong SAR, Hong Kong; Yeap, S.S., Department of Medicine, Subang Jaya Medical Centre, Selangor, Malaysia; Li, Z., Department of Rheumatology & Immunology, Peking University People's Hospital, 11 Xizhimen South St.Beijing 100044, China; on behalf of APLAR RA SIG group