den Bakker, Emil
Koene, Berend
van Wijk, Joanna A. E.
Hubeek, Isabelle
Gemke, Reinoud
Bökenkamp, Arend
Article History
Received: 24 October 2017
Accepted: 25 March 2018
First Online: 9 June 2018
Compliance with ethical standards
:
: On behalf of all authors, the corresponding author states that there is 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. For this type of study formal consent is not required.