Received: 1 March 2021
Accepted: 28 April 2021
First Online: 10 June 2021
: This study was conducted in accordance with the declaration of Helsinki. This study was conducted with approval from the Ethics Committee of Peking University Huilongguan Clinical Medical School. All patients signed an informed consent form for inclusion in the study.
: Not applicable.
: None of the authors have any financial disclosure or conflict of interest.