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Article History

Accepted: 3 December 2020

First Online: 2 January 2021

Conflict of Interest

: The authors declare that they have no conflict of interest.

: All procedures performed in this study involving human participants were in accordance with the ethical standards of the academic committee at Shandong Normal University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: Informed consent was obtained. The participants know every aspect of their participation and permit to use their data with anonymity.

: Not applicable.

: Not applicable.