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Contributors AM did the literature review, writing, editing, and submission of the article. AA wrote and edited the article. ME reviewed the article and provided images. FMY did the literature review, writing, and editing of the article.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.