1. Department of General Medicine Sengkang General Hospital Singapore City Singapore
2. Department of Rheumatology and Immunology Singapore General Hospital Singapore City Singapore
3. Department of Medicine, Yong Loo Lin School of Medicine National University of Singapore Singapore City Singapore
4. Department of Rheumatology, Allergy and Immunology Tan Tock Seng Hospital Singapore City Singapore
5. Division of Rheumatology, Department of Medicine National University Hospital Singapore City Singapore