[1] Peking Univ, Sch Publ Hlth, Dept Hlth Policy & Manage, Beijing, Peoples R China
[2] Chinese Acad Med Sci & Peking Union Med Coll, Canc Hosp, Natl Canc Ctr, Natl Clin Res Ctr Canc, 17 Panjiayuan Nanli, Beijing, Peoples R China
[3] Luoyang Orthoped Hosp Henan Prov, Nursing Dept, Zhengzhou, Peoples R China
[4] Anhui Med Univ, Joint Logist Support Unit 904 Hosp, Sch Med, Dept Neurosurg, Wuxi, Peoples R China
[5] Anhui Med Univ, Joint Logist Support Unit 904 Hosp, Sch Med, Dept Neurosurg, Wuxi 230022, Peoples R China
[6] Peking Univ, Sch Publ Hlth, Dept Hlth Policy & Manage, 38 Xueyuan Rd, Beijing 100191, Peoples R China