[1] Natl Taiwan Univ Hosp, Dept Orthoped, Taipei, Taiwan
[2] Taipei Med Univ, Sch Healthcare Adm, Coll Management, Taipei, Taiwan
[3] Natl Taiwan Univ, Inst Hlth Policy & Management, Coll Publ Hlth, Taipei, Taiwan
[4] Natl Taiwan Univ Hosp, Dept Orthoped, Hsinchu Branch, Taipei, Hsinchu County, Taiwan
[5] Natl Taiwan Univ Hosp, Dept Geriatr & Gerontol, Taipei, Taiwan
[6] Amgen Taiwan Ltd, Taipei, Taiwan
[7] Amgen Inc, Thousand Oaks, CA 91320 USA
[8] Natl Taiwan Univ Hosp, Chu Tung Branch, Superintendent Off, Taipei, Hsinchu County, Taiwan