[1] Chinese Univ Hong Kong, Jockey Club Sch Publ Hlth & Primary Care, Hong Kong, Peoples R China
[2] Karolinska Inst, Inst Environm Med, Musculoskeletal & Sports Injury Epidemiol Ctr MUS, Stockholm, Sweden
[3] Univ Technol Sydney, Fac Hlth, Australian Res Ctr Complementary & Integrat Med A, Sydney, NSW, Australia
[4] Chinese Univ Hong Kong, Sch Chinese Med, Hong Kong, Peoples R China
[5] Univ Duisburg Essen, Fac Med, Dept Internal & Integrat Med, Evang Kliniken Essen Mitte, Essen, Germany