Funding for this research was provided by:
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (451-17-032)
Received: 4 May 2018
Accepted: 2 November 2018
First Online: 13 November 2018
Compliance with ethical standards
: The authors report no conflicts of interest for this study.
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki and all procedures involving human subjects were approved by the ethical review board of each participating center. Written informed consent was obtained from all subjects.