Funding for this research was provided by:
National Natural Science Foundation of China (81703854)
Text and Data Mining valid from 2019-08-30
Received: 5 September 2018
Accepted: 20 August 2019
First Online: 30 August 2019
Ethics approval and consent to participate
: The protocol for this research project was approved by the local Clinical Ethics Committee and written informed consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.