Funding for this research was provided by:
Maastricht University
Article History
Received: 8 January 2018
Accepted: 28 January 2018
First Online: 2 March 2018
Compliance with ethical standards
: The study was conducted in accordance with the code of ethics on human experimentation established by the declaration of Helsinki (1964) and amended in Seoul (2008). All participants were informed about the study’s goal, procedures, and potential hazards in writing, and they gave their informed consent in writing. The Medical Ethics Committees of Maastricht University approved the study. Participants received a financial compensation for their participation in the study.