Funding for this research was provided by:
National Natural Science Foundation of China (81471597, 81671612, 81601427)
Natural Science Foundation of Guangdong Province (2014A030313074, 2017A030313576)
Natural Science Foundation of Guangdong Province (2016A030313307)
Guangdong Medical Scientific Research Foundation (A2017109)
Key Program of Young Teachers Foundation of Sun Yat-sen University (17ykjc12)
Received: 24 October 2017
Accepted: 19 February 2018
First Online: 2 May 2018
Ethics approval and consent to participate
: This study was conducted in compliance with the Helsinki Declaration. Due to the retrospective nature of the study, informed consent was waived. The study was approved by the Medical Ethics Committee of Sun Yat-Sen Memorial Hospital (identifier SYSEC-KY-KS-011).
: All participants have approved publication of the data in this manuscript.
: The authors declare that they have no competing interests.
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