Footnotes

• Contributors Idea for the article: MP. Literature search and writing the article: JM, JPM, MS, MP. Guarantors: MP, JM.

• Funding Our work was not supported by any other funder.

• Competing interests JM is a part-time employee of the Food Packaging Forum and has no restrictions on carrying out scientific research. MS and MP are members of the Food Packaging Forum Foundation's board, a non-profit charitable organisation based in Zurich, Switzerland. They receive no financial compensation for their board membership and duties. JPM is a member of the Food Packaging Forum Foundation's Scientific Advisory Board. He receives no financial compensation for his role on the board.

• Provenance and peer review Commissioned; externally peer reviewed.