Funding for this research was provided by:
Natural Science Foundation of Zhejiang Province (LY15H060009)
Received: 24 August 2018
Accepted: 19 November 2018
First Online: 30 November 2018
Ethics approval and consent to participate
: This retrospective study was approved by the Ethics Committee of Second Affiliated Hospital of Wenzhou Medical University, and informed written consent for participation in the study was obtained.
: Not applicable.
: The authors declare that they have no competing interest.
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