Received: 29 October 2017
Accepted: 7 October 2018
First Online: 22 October 2018
Ethics approval and consent to participate
: Received ethical approval by the Committee of Medical Ethics at the Ghent University Hospital, Belgium with project number EC/20116/0499 and Belgian registration number B670201628242. Informed consent was signed by every participant.
: Not applicable.
: The authors declare that they have no competing interests.
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