Received: 28 February 2017
Accepted: 30 January 2018
First Online: 6 March 2018
Ethics approval and consent to participate
: This study is approved by the Medical Ethics Committee Maastricht University Hospital (approval number, NL4294206813). This trial is registered in the Netherlands Trial Register NTR 3789 (date of registration, 11 January 2013). We have obtained informed consent from all participants in the study.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.