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Additional Information

Competing Interests

Prof Georg Lietz is a member of the International Carotenoid Society, American Nutrition Society, and the European Nutrition Leadership Programme Alumni Association.

Gavin Stewart is an editor for PeerJ, research synthesis methods and Cochrane/Campbell collaborations.

Author Contributions

Wasim A Iqbal conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the paper, approved the final draft.

Gavin B Stewart conceived and designed the experiments, analyzed the data, authored or reviewed drafts of the paper, approved the final draft.

Ines Mendes analyzed the data.

Kieran Finney analyzed the data.

Anthony Oxley contributed reagents/materials/analysis tools, authored or reviewed drafts of the paper, approved the final draft.

Georg Lietz contributed reagents/materials/analysis tools, authored or reviewed drafts of the paper, approved the final draft.

Data Deposition

The following information was supplied regarding data availability:

The research in this article did not generate any data or code as it is only a protocol.

Funding

The authors received no funding for this work.


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