Article History
Received: 18 October 2016
Accepted: 24 November 2016
First Online: 19 December 2016
Compliance with ethical standards
:
: AWB, SA and EDB declare that they have no competing interests. MGJ developed and holds a patent on the software used in the study.
: The study was approved by the regional ethics committee, The North Denmark Region Committee on Health Research Ethics.
: All participants gave written informed consent.