Funding for this research was provided by:
National Natural Science Foundation of China (81770654, 81571750, 81771908)
Text and Data Mining valid from 2019-04-18
Received: 12 December 2018
Accepted: 3 April 2019
First Online: 18 April 2019
Ethics approval and consent to participate
: This study conforms to the ethical guidelines for human research and the Health Insurance Portability and Accountability Act. The experimental protocol was approved by the First Affiliated Hospital of Sun Yat-Sen University. Written informed consent of each participant was obtained and there is no publication of identifying information or images of study participants in the manuscript.
: The authors declare that they have no competing interests.
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