Funding for this research was provided by:
National Natural Science Foundation of China (81701539, 81571496)
Text and Data Mining valid from 2019-08-05
Received: 3 March 2019
Accepted: 21 July 2019
First Online: 5 August 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of tongji medical college.
: Not applicable.
: The authors declare that they have no competing interests.