Received: 17 September 2016
Accepted: 3 November 2017
First Online: 25 January 2018
Ethics approval and consent to participate
: This study was approved by ethics committee board of West China Hospital, Sichuan University. All study participants provided a written informed consent to agree the clinical data to be used in clinical research and publication.
: Not applicable.
: The authors declare that they have no competing interests.
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