van Velthuijsen, Eveline L. http://orcid.org/0000-0002-2875-7684
Zwakhalen, Sandra M. G.
Pijpers, Evelien
van de Ven, Liesbeth I.
Ambergen, Ton
Mulder, Wubbo J.
Verhey, Frans R. J.
Kempen, Gertrudis I. J. M.
Article History
First Online: 2 February 2018
Compliance with Ethical Standards
:
: No sources of funding were used to assist in the conduct of this study or the preparation of this article.
: Eveline van Velthuijsen, Sandra Zwakhalen, Evelien Pijpers, Liesbeth van de Ven, Ton Ambergen, Wubbo Mulder, Frans Verhey and Gertrudis Kempen declare that they have no conflicts of interest relevant to the content of this article.
: Ethical approval for this study was obtained from the Medical Ethical Committee of the Maastricht University Medical Centre+. 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 is a retrospective study; for this type of study no formal consent is required.