[1] Natl Univ Singapore Hosp, Dept Med, Div Rheumatol, Singapore, Singapore
[2] Natl Univ Singapore, Yong Loo Lin Sch Med, Singapore, Singapore
[3] Natl Univ Singapore Hosp, Dept Radiol, Singapore, Singapore
[4] Alexandra Hosp, Dept Radiol, Singapore, Singapore
[5] Natl Univ Singapore Hosp, Dept Med, Div Rheumatol, 5 Lower Kent Ridge Rd, Singapore 119074, Singapore