Funding for this research was provided by:
National Natural Science Foundation of China (81771331)
Natural Science Foundation of Guangdong Province (2017A030313595)
Text and Data Mining valid from 2020-01-17
Received: 31 August 2019
Accepted: 7 January 2020
First Online: 17 January 2020
Ethics approval and consent to participate
: This retrospective study was approved by the Institutional Ethics Committee of the First Affiliated Hospital of Jinan University. Informed consent was waivered due to the retrospective and noninterventional nature of the study. Written informed consent for publication was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.