Article History
Received: 30 April 2018
Accepted: 3 May 2018
First Online: 7 May 2018
Compliance with ethical standards
:
: Karel Eechoute declares that he has no conflict of interest. Ron Mathijssen declares that he has no conflict of interest. Teun van Gelder declares that he has no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.