Jin, Fan
Xie, Jing
Wang, Huan-ling
Article History
Received: 9 February 2021
Accepted: 26 April 2021
First Online: 14 May 2021
Declarations
:
: The present study was reviewed and approved by the Institutional Review Board (IRB) of Peking Union Medical College Hospital. The IRB waived the requirement to obtain informed consent from each patient because the study met the IRB’s minimal risk waiver criteria. We declare that all methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.