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Contributors BF and JB acquired data; BF prepared the letter with the help of DM and GJ. All authors have read and approved the final manuscript.
Funding This work was supported by a grant from the French Research Ministry (ANR-10-ALIA-016 Surfing).
Competing interests DM is employed by the French dairy industry. None of the coauthors have any disclosures and competing financial interest to declare.
Provenance and peer review Not commissioned; externally peer reviewed.