[1] Natl Univ Singapore, Dept Med, Singapore, Singapore
[2] Duke NUS Med Sch, Program Hlth Serv & Syst Res, Singapore, Singapore
[3] Singapore Gen Hosp, Dept Rheumatol & Immunol, Singapore, Singapore
[4] Natl Univ Singapore, Fac Sci, Dept Pharm, Singapore, Singapore
[5] SingHlth Reg Hlth Syst, Ctr Populat Hlth Res & Implementat, Singapore, Singapore
[6] Sengkang Gen Hosp, Dept Gen Med Rheumatol, Singapore, Singapore
[7] Duke NUS Med Sch, Singapore, Singapore