Funding for this research was provided by:
National Natural Science Foundation of China (81771489)
National High Technology Research and Development Program of China (2014AA020610)
Beijing Municipal Science & Technology Commission (Z171100000117002)
China National Key Research and Development Program (2017YFC0908300)
Text and Data Mining valid from 2019-10-29
Received: 14 May 2019
Accepted: 18 October 2019
First Online: 29 October 2019
Ethics approval and consent to participate
: This study was approved by the medical ethics committee of Beijing Tiantan Hospital.
: All the authors in this paper consent to publication of the work.
: The authors declare that they have no competing interests.