Footnotes

• Contributors Both authors contributed to the design, analysis and interpretation of the findings. The first author (DAR) wrote the first draft. Both authors approved the final submitted version.

• Funding This project was supported by the Canada Research Chair in Medical Decision Sciences and the Canadian Institutes of Health Research.

• Competing interests None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.

• Author note Crowdsourcing provides a practical method to support hand hygiene by allowing outpatients, families, visitors, staff, volunteers and other to notify hospital support services about empty hand sanitizer dispensers that requires refilling.