Received: 30 April 2020
Accepted: 27 August 2020
First Online: 5 October 2020
Ethics approval and consent to participate
: The study was conducted in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of Beijing Tiantan Hospital (No. KY2015-021-04). Written informed consent was obtained from each patient before enrolment in the study.
: Not applicable
: The authors declare that they have no conflict of interest.