1 Division of Rheumatology, Department of Medicine, National University Hospital, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore. Electronic address: sen_hee_tay@nuhs.edu.sg.
2 Division of Rheumatology, Department of Medicine, National University Hospital, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
3 Centre for Biomedical Informatics, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore; Singapore Immunology Network, Agency for Science, Technology and Research, Singapore.
4 Department of Dermatology, University of Minnesota, Minneapolis, Minn.