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Don’t judge a book by its cover: except during optical evaluation

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  • Contributors Drafting of the article: NS. Critical revision of the article for important intellectual content: WAvH, SV, MJB. Final approval of the article: MJB.

  • 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.

  • Patient consent for publication Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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