Funding for this research was provided by:
University of Aberdeen
Received: 15 August 2018
Accepted: 17 September 2018
First Online: 5 October 2018
Compliance with ethical standards
: Informed consent was obtained from all individual participants included in the study.
: Thomas G. W. Harris, Helen S. Wohlgemut, Gerald Lip and Alain Pierre Robert Curnier declare that they have no conflict of interest.
: For this kind of study formal consent from a local ethics committee is not required.