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Article History

Received: 1 June 2018

Accepted: 27 August 2018

First Online: 11 September 2018

Ethics approval and consent to participate

: As our study concerned no personal issues, participants were not subjected to acts and the participants were consenting adults, no ethics approval was needed in the Netherlands. Participation was voluntary and anonymous. Patients received an invitation letter from the Dutch umbrella organisation. A card was included that could be sent back if one did not wish to participate.

: Participants were informed of the purposes of our study. Participation was voluntary and anonymous. No individual patient data is discussed.

: The authors declare that they have no competing interests.

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