Text and Data Mining valid from 2019-04-06
Received: 5 February 2019
Accepted: 15 March 2019
First Online: 6 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with animals performed by any of the authors.
: Research done for this study complies with the current laws of The Netherlands.
: Informed consent was obtained from all individual participants included in the study.