de Valk, S. http://orcid.org/0000-0001-8736-6328
Kuiper, C.
van der Helm, G. H. P.
Maas, A. J. J. A.
Stams, G. J. J. M.
Article History
Received: 9 May 2018
Accepted: 27 July 2018
First Online: 30 July 2018
Compliance with Ethical Standards
:
: The authors declare to have 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.
: Informed consent was obtained from all individual participants included in the study.