Funding for this research was provided by:
National Natural Science Foundation of China (81730091, 81502809)
Text and Data Mining valid from 2019-07-11
Received: 10 January 2019
Accepted: 25 June 2019
First Online: 11 July 2019
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of Tianjin Medical University. All participants provided written informed consent before participating in the study.
: Not applicable.
: The authors declare that they have no competing interests.