Funding for this research was provided by:
National Natural Science Foundation of China (81830043)
Received: 8 October 2019
Accepted: 25 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of Peking Union Medical College Hospital. And written informed consents were obtained.
: Not applicable.
: The authors declare that they have no conflicts of interest.