[1] Natl Univ Hlth Syst, Podiatry Dept, Rehabil Ctr, Singapore, Singapore
[2] Natl Univ Singapore, Yong Loo Lin Sch Med, Singapore, Singapore
[3] Natl Univ Hlth Syst, Div Rheumatol, Dept Med, Singapore, Singapore
[4] AUT Univ, Hlth & Rehabil Res Inst, Fac Hlth & Environm Sci, Auckland, New Zealand