Received: 21 September 2018
Accepted: 29 May 2019
First Online: 14 June 2019
Ethics approval and consent to participate
: This study was approved by the ethical comité of the University Hospital in Ghent (ethisch.comité@uzgent.be). The study was registered as study B670201112688 (ExternalRef removed). All subjects gave an informed consent to participate in this study.
: Consent of publication was obtained from all subjects.
: The authors declare that they have no competing interests.