Funding for this research was provided by:
Maastricht University Medical Center
Article History
Received: 11 March 2018
Revised: 15 May 2018
Accepted: 23 May 2018
First Online: 12 June 2018
Compliance with ethical standards
: The study was approved by the Ethical Committee of the Leiden University Medical Centre. Participants provided consent for use of anonymized data for research purposes and no specific consent was necessary for the analyses presented in this manuscript.
: None.