Funding for this research was provided by:
National Natural Science Foundation of China (81800288, 81571515)
Department of Science and Technology of Sichuan Province (2017SZ0117)
Received: 23 July 2019
Accepted: 6 November 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: The study was approved by the University Ethics Committee on Human Subjects at Sichuan University. Informed consent was obtained from all individual participants included in this study.
: Written consent obtained.
: The authors declare that they have no competing interests.