Funding for this research was provided by:
the Joint Research Fund for Overseas Natural Science of China (31429004)
Text and Data Mining valid from 2019-06-24
Received: 18 January 2019
Accepted: 24 May 2019
First Online: 24 June 2019
Ethics approval and consent to participate
: The study was approved by the institutional review board of Peking University Third Hospital. All participants signed an informed consent form to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.