Received: 1 February 2019
Accepted: 12 August 2019
First Online: 20 August 2019
Ethics approval and consent to participate
: The ethical review board of Tilburg University approved the questionnaire development procedure. The medical ethical committee of the Catharina Hospital granted approval for the study. Prior to the study, all participants gave written informed consent.
: All participants gave informed consent including consent for publication.
: The authors declare that they have no competing interests.