[1] Anhui Med Univ, Sch Hlth Adm, Hefei 230032, Anhui, Peoples R China
[2] Wolverhampton Univ, Sch Hlth & Wellbeing, Ctr Hlth & Social Care Improvement, Wolverhampton WV1 1DT, W Midlands, England
[3] Univ Nottingham, Div Primary Care, Nottingham NG7 2RD, England
[4] Guangzhou Med Univ, Sch Publ Hlth & Gen Practice, Guangzhou 510182, Guangdong, Peoples R China
[5] Shanxi Med Univ, Dept Hlth Adm & Serv, Taiyuan 030001, Shanxi, Peoples R China
[6] Kings Coll London, Div Hlth & Social Care Res, London SE1 3QU, England