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Article History

Received: 18 March 2021

Accepted: 12 July 2021

First Online: 19 August 2021

Declarations

:

: All authors declare that the research has been conducted according to the principles of the World Medical Association Declaration of Helsinki “Ethical Principles for Medical Research Involving Human Subjects.” This study does not require approval from an ethics committee because it performs a bibliometric analysis/citation analysis of the existing published classical studies.

: Informed consent is not required as our work is a retrospective international data study.

: None.