Funding for this research was provided by:
Capital Foundation of Medical Development (2016-2-1073)
Text and Data Mining valid from 2019-06-03
Received: 26 November 2018
Accepted: 7 May 2019
First Online: 3 June 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board of Beijing Tiantan Hospital, Capital Medical University. KY 2018–064-02.
: Not applicable
: The authors declare that they have no competing interests.