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Article History

Received: 13 May 2020

Accepted: 31 July 2020

First Online: 14 August 2020

Ethics approval and consent to participate

: The study involving human participants was approved by the institutional review board of the Shandong Provincial Hospital (no. 2019-133). Written consent was obtained from all the participants. The methods were carried out in accordance with the approved guidelines. All clinical research was performed on the basis of the principles expressed in the Declaration of Helsinki.

: Not applicable.

: The authors declare no competing interests.