Funding for this research was provided by:
National Natural Science Foundation of China (81800244, 81670237)
Text and Data Mining valid from 2019-11-13
Received: 3 August 2019
Accepted: 28 October 2019
First Online: 13 November 2019
Ethics approval and consent to participate
: The study was approved by the medical ethics committee of Zhongda Hospital and all methods were performed in accordance with the applicable guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.