1. Division of Respiratory Medicine; Prince of Wales Hospital, The Chinese University of Hong Kong; Hong Kong, SAR; China
2. Department of Medicine and Rheumatology Unit; Hospital Clínico Universitario, USC; Santiago de Compostela; Spain
3. Division of Rheumatology, Department of Internal Medicine; Hanyang University Hospital, Hanyang University College of Medicine; Seoul; Korea
4. Division of Rheumatology; Department of Medicine and Therapeutics; Prince of Wales Hospital, The Chinese University of Hong Kong; Hong Kong, SAR; China