Funding for this research was provided by:
National Natural Science Foundation of China (81872692)
Beijing Municipal Natural Science Foundation (7182085)
National Key Technology R&D Program in the 12th Five-Year Plan of China (2011BAI11B06)
Text and Data Mining valid from 2019-10-08
Received: 21 July 2019
Accepted: 17 September 2019
First Online: 8 October 2019
Ethics approval and consent to participate
: Ethnical approval for this study has been granted by the Medical Ethics Committee of Peking University First Hospital and the study complied with the ethical principles underlying the Declaration of Helsinki. All participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.