Ding, Ning
Yan, Dan
Li, Honghe
Ma, Yuan
Wen, Deliang
Funding for this research was provided by:
Social Science Foundation of Chinese Ministry of Education (14YJAZH085)
Article History
Received: 17 November 2016
Accepted: 10 September 2018
First Online: 17 September 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of China Medical University. All participants signed an informed consent form, in which confidentiality was guaranteed.
: Not applicable.
: The authors declare that they have no competing interests.
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