[1] Chung Shan Med Univ, Sch Med, Taichung, Taiwan
[2] Cishan Hosp, Minist Hlth & Welf, Dept Orthoped, Kaohsiung, Taiwan
[3] Natl Sun Yat Sen Univ, Inst Med Sci & Technol, Kaohsiung, Taiwan
[4] Minghsin Univ Sci & Technol, Dept Senior Serv Ind Management, Hsinchu, Taiwan
[5] Shu Te Univ, Dept Recreat & Sport Management, Kaohsiung, Taiwan
[6] Harvard TH Chan Sch Publ Hlth, Dept Epidemiol, Boston, MA USA
[7] Univ Penn, Perelman Sch Med, Ctr Global Hlth, Philadelphia, PA 19104 USA
[8] Natl Taiwan Univ, Grad Inst Biomed Elect & Bioinformat, Taipei, Taiwan
[9] Singapore Gen Hosp, Dept Rheumatol & Immunol, Level 4,20 Coll Rd, Singapore 169856, Singapore
[10] Duke NUS Med Sch, Singapore, Singapore