Text and Data Mining valid from 2019-12-01
Received: 6 October 2019
Accepted: 4 December 2019
First Online: 12 December 2019
Ethics approval and consent to participate
: The study was approved by the Institute Review Board of the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China. All patients provided informed consent to participate in the study.
: All patients provided informed consent to publish the data.
: The authors declare that they have no competing interests.