Received: 27 April 2018
Accepted: 24 September 2018
First Online: 3 October 2018
Ethics approval and consent to participate
: Every potential respondent received an invitational letter, containing information on the study and the survey contained an informed consent. A qualified ethics review committee, Antwerp University Hospital – University of Antwerp Belgium, approved the study on November 14th 2016 (reference number 14/42/428).
: Not applicable.
: The authors declare that they have no competing interests.
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