de Groot, R.
Nijmeijer, W. S.
Folbert, E. C.
Vollenbroek-Hutten, M. M. R.
Hegeman, J. H.
Article History
Received: 2 December 2019
Accepted: 7 January 2020
First Online: 22 February 2020
Compliance with ethical standards
:
: None. 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.