Funding for this research was provided by:
Global Hygiene Council (n/a)
Received: 20 October 2019
Accepted: 29 January 2020
First Online: 6 February 2020
Ethics approval and consent to participate
: The current review contained no participants and did not require ethical approval.
: No individual person’s data in any form is contained in the current article.
: The authors declare that they have no competing interests.