Article History
Received: 28 September 2020
Accepted: 31 January 2021
First Online: 9 February 2021
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board for Human Studies of Beijing Chaoyang Hospital, Beijing, China. (2019–315) The review board exempted the acquisition of informed consent from patients included in the study.
: Not applicable – this study does not contain any patient personal details.
: The authors declare that they have no competing interests.