作者机构:[1]School of Public Policy and Administration, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China, [2]Shaanxi Provincial People's Hospital, Xi'an, Shaanxi 710068, China, [3]School of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
相关基金:This study was supported by grants from the China Medical Board (No. 10-029), the National Natural Science Foundation of China (No. 70873093), the Humanities and Social Science Foundation of Chinese Ministry of Education (No. 09YJAZH071).
Correspondence to: Prof. ZHANG Si-feng, School of Public Policy and Administration, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China (Tel: 86-29-82665482. Fax: 86-29-82665959. Email: gongguanmyorder@ 163.com)