Funding for this research was provided by:
Q-support Foundation (UMCN-140928-00)
Received: 25 February 2019
Accepted: 6 May 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: All participants provided written informed consent and the study was approved by the Medical Ethical Review Committee of the Arnhem-Nijmegen region.
: Not applicable.
: The authors declare that they have no competing interests.