Funding for this research was provided by:
FP7 Research for the Benefit of SMEs (315683)
Received: 22 October 2018
Accepted: 22 September 2019
First Online: 17 October 2019
Ethics approval and consent to participate
: All participants gave informed consent and the protocol was approved by the Ethics Review Committee of the Maastricht University Medical Centre (Registration number NL43956.068.13).
: Not applicable.
: The authors declare that they have no competing interests.