Funding for this research was provided by:
National Natural Science Foundation of China (81572093 and 81741123)
Received: 24 February 2020
Accepted: 4 May 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: Written informed consent was obtained from all patients. The study was approved by the hospital institutional review board of Peking Union Medical College Hospital, and complied with the Declaration of Helsinki (JS-981).
: Not applicable.
: The authors declare that they have no competing interests.