Received: 6 August 2020
Accepted: 16 November 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: This study was conducted according to the recommendations of the Declaration of Helsinki and was approved by the institutional review boards of the sixth clinical institute, Capital Medical University, Beijing, China. Written consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.