Funding for this research was provided by:
National Natural Science Foundation of China (81570633)
Science and Technology Project of Guangzhou (201604020001)
Guangzhou Science Technology and Innovation Commission (201607010162)
Text and Data Mining valid from 2019-04-29
Received: 28 October 2018
Accepted: 12 April 2019
First Online: 29 April 2019
Ethics approval and consent to participate
: This research was approved by the human ethics committee of the First Affiliated Hospital of Guangzhou Medical University (Guangzhou, Guangdong, China). All patients signed the informed consent prior to the study.
: Not applicable.
: The authors declare that they have no competing interests.
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