Funding for this research was provided by:
the Second Hospital of Hebei Medical University, China. (820)
Received: 30 April 2018
Accepted: 25 July 2018
First Online: 16 August 2018
Ethics approval and consent to participate
: Ethics approval and consent to participate was obtained from the ethics committee of the Institutional Review Board of the Second Hospital of Hebei Medical University(2015–820).
: Consent was obtained.
: The authors declare that they have no competing interests.
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