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Declaration of interest:
Where is read: Declaration of Interest: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.
It should read:
Declaration of Interest: This study was sponsored by Colgate Palmolive Company. Elisabeth Gittins, Bernal Stewart and Yun Po Zhang are currently employed by Colgate Palmolive Company. The other authors are independent researchers.
