Van der Elst, Michael
,
Schoenmakers, Birgitte
Duppen, Daan
Lambotte, Deborah
Fret, Bram
Vaes, Bert
De Lepeleire, Jan
Article History
Received: 8 June 2017
Accepted: 8 October 2018
First Online: 20 October 2018
Ethics approval and consent to participate
: This study was conducted according to the ethical guidelines laid down in the Declaration of Helsinki, and because no human subjects were involved; no informed consent was necessary and no ethics committee was involved.
: not applicable.
: The authors declare that they have no competing interests.
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