Received: 22 October 2018
Accepted: 2 January 2019
First Online: 15 January 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China (No. KY201818). Written informed consent was obtained from the patients for the storage of samples and data, follow-up contact, and further use of samples and data for research purposes.
: Not applicable.
: The authors declare that they have no competing interests.
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