Funding for this research was provided by:
National Natural Science Foundation of China (81471287, 81071024)
Text and Data Mining valid from 2019-12-01
Received: 18 April 2019
Accepted: 18 November 2019
First Online: 12 December 2019
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board for Human Investigation at Case Western Reserve University.
: Not applicable.
: The authors declare that they have no competing interests.