Funding for this research was provided by:
National Natural Science Foundation of China (81970106)
Article History
Received: 1 December 2020
Accepted: 29 December 2020
First Online: 19 January 2021
Ethics approval and consent to participate
: Written informed consent to participate was obtained from all of the participants in the study, and the study was conducted in accordance with the Declaration of Helsinki. The study protocol was approved by the Ethics Committee of Peking Union Medical College Hospital.
: Written informed consent for the publication of identifying images or other personal or clinical details was obtained from all of the participants in the study. A copy of the written consent is available for review by the Editor of this journal.
: The authors declare that they have no conflicts of interest.