[1] Queen Mary Hosp, Pokfulam, Hong Kong, Peoples R China
[2] Tuen Mun Hosp, Dept Med, Tuen Mun, Hong Kong, Peoples R China
[3] Queen Elizabeth Hosp, Yau Ma Tei, Hong Kong, Peoples R China
[4] Hong Kong Soc Rheumatol, Kowloon, Tung Chau St, Hong Kong, Peoples R China