[1] Chang Gung Univ, Dept Hlth Care Management, Coll Management, Taoyuan 333, Taiwan
[2] Chang Gung Univ, Div Endocrinol & Metab, Dept Internal Med, Chang Gung Mem Hosp, Taoyuan 333, Taiwan
[3] Univ Sydney, Sydney Sch Publ Hlth, Sydney, NSW 2006, Australia
[4] Natl Hlth Res Inst, Inst Populat Hlth Sci, Div Prevent Med & Hlth Serv Res, 35 Keyan Rd,A3223, Maoli 350, Taiwan