Funding for this research was provided by:
Capital Characteristic Clinic Project (Z151100004015171)
Received: 1 June 2017
Accepted: 16 January 2018
First Online: 3 February 2018
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of Peking University Third Hospital [IRB00006761]. All patients provided written informed consent to participate in this study.
: Not applicable.
: The authors declare that they have no competing interests.
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