[1
]School of Public Health; Shanxi Medical University; No. 56, Xin-Jian S. Road Taiyuan
030001 China
[2
]Department of Information Management; Shanxi Medical University; No. 56, Xin-Jian
S. Road Taiyuan 030001 China
[3
]The Robert Darbishire Practice; Rusholme Health Centre; Walmer Street, Rusholme Manchester
England M14 5NP United Kingdom
[4
]Stanford University School of Medicine; 871 Warren Way Palo Alto CA 94303 USA
[5
]School of Public Health; Tongji Medical College; Huazhong University of Science and
Technology; No. 13, Hang-Kong Road Wuhan 430030 China