1. Division of Allergy, Immunology and Rheumatology, Department of Internal Medicine Taichung Veterans General Hospital Taichung Taiwan
2. Department of Public Health, College of Medicine National Cheng Kung University Tainan Taiwan
3. Department of Rheumatology Royal Wolverhampton Hospitals NHS Trust Wolverhampton UK
4. Division of Musculoskeletal and Dermatological Sciences, Centre for Musculoskeletal Research, School of Biological Sciences The University of Manchester Manchester UK
5. Department of Rheumatology, City Hospital Sandwell and West Birmingham Hospitals NHS Trust Birmingham UK