Document is current

Article History

Received: 8 July 2023

Accepted: 22 April 2024

First Online: 6 May 2024

Competing interests

: The authors declare no competing interests.

: All procedures performed in studies involving human participants were in accordance with the Ethics Review Committee of the School of Mathematical Sciences, Beijing Normal University [BNUMATH-GUO-01] and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

: Informed consent was obtained from all the participants included in this study.