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Correction notice This article has been corrected since published online. The text has been corrected from "to men" to "two men" in the first sentence.
Contributors ERS and BS both are guarantors of integrity of the entire study and both contributed to the project design, literature research, preparation and editing of this work.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.