Marck, Klaas W.
van Wingerden, Jan J.
Article History
Received: 30 October 2017
Accepted: 5 December 2017
First Online: 2 February 2018
Compliance with ethical standards
:
: None.
: Klaas Marck and Jan van Wingerden declare that they have no conflicts of interest.
: For this type of article, formal consent from a local ethics committee is not required.