Shi, Rui
Zhao, Lei
Qi, Yun
Funding for this research was provided by:
Science & Technology project for Social development of Shaanxi Province (2017SF-249)
Article History
Received: 21 October 2017
Accepted: 6 April 2018
First Online: 18 April 2018
Ethics approval and consent to participate
: This case-control study was approved by the Institutional Review Board of Shaanxi provincial peoples’ hospital. All participants gave written informed consent, and the study adhered to the tenets of the Declaration of Helsinki.
: All authors declare that they have no competing interests.
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