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Article History

Received: 17 April 2018

Accepted: 28 November 2018

First Online: 18 December 2018

Ethics approval and consent to participate

: Ethic issues concerning “Humans” and “Protection of personal data” arose from the use of the web survey and from the statistical analyses of web survey data. All research activities followed fundamental ethical principles (European Directive 95/46/EC on the protection of individuals with regard to the processing of personal data). All participants were invited via email and informed about the objective, scope and research design of the study and about its research uses. All participants chose to participate in the study. No personal data beyond age was collected. All data generated or analysed during this study are included in this article.

: Not applicable.

: None of the authors have any competing interests.

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