Funding for this research was provided by:
National Basic Research Program of China (973 Program) (2017YFC1310401)
Department of Science and Technology of Sichuan Province (2017HH0059)
Text and Data Mining valid from 2020-04-10
Received: 16 October 2019
Accepted: 24 March 2020
First Online: 10 April 2020
Ethics approval and consent to participate
: All procedures of this study were performed in accordance with the Declaration of Helsinki and were approved by Ethics Committee of West China Medical College, Sichuan University. All participants gave written informed consent prior to taking part in this study.
: Not applicable.
: The authors declare that they have no competing interests.