[1] Natl Univ Hlth Syst, Univ Med Cluster, Div Rheumatol, Singapore 119228, Singapore
[2] Natl Univ Hlth Syst, Alexandra Hosp, Chron Program, Singapore 159964, Singapore
[3] Hlth Sci Author, Vigilance & Compliance Branch, Singapore 138667, Singapore
[4] Duke Kunshan Univ, Global Hlth Res Ctr, Suzhou 215316, Peoples R China
[5] Duke NUS Med Sch, Hlth Serv & Syst Res, Singapore 169857, Singapore