[1] Chang Gung Univ, Sch Nursing, Tao Yuan 333, Taiwan
[2] Chang Gung Univ, Dept Publ Hlth, Tao Yuan 333, Taiwan
[3] Chang Gung Univ, Ctr Biostat, Tao Yuan 333, Taiwan
[4] Chang Gung Univ, Grad Inst Nursing, Tao Yuan 333, Taiwan
[5] Univ Michigan, Sch Publ Hlth, Ann Arbor, MI 48109 USA
[6] Univ Michigan, Inst Gerontol, Ann Arbor, MI 48109 USA
[7] Chang Gung Mem Hosp, Trauma Div, Dept Orthoped, Tao Yuan, Taiwan
[8] Chang Gung Mem Hosp, Dept Internal Med, Tao Yuan, Taiwan
[9] Chang Gung Mem Hosp, Dept Phys Med & Rehabil, Tao Yuan, Taiwan
[10] Chang Gung Mem Hosp, Dept Orthoped, Chilung, Taiwan