Article History
Received: 20 November 2018
Accepted: 19 January 2019
First Online: 30 January 2019
Compliance with ethical standards
:
: Romain Sonneville declares that he has no conflict of interest. Eric Mariotte declares that he has no conflict of interest. Matthijs Brouwer declares that he has no conflict of interest.
: An approval by an ethics committee was not applicable.
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