Funding for this research was provided by:
Received: 6 November 2017
Accepted: 19 April 2018
First Online: 3 May 2018
Ethics approval and consent to participate
: 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. The Medical Ethics Committee Brabant approved the study (NW2016-26). Informed consent was obtained from all participants.
: The authors declare that they have no competing interests.
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