Kaufmann, Anton
Widmer, Mirjam
Maden, Kathryn
Butcher, Patrick
Walker, Stephan
Article History
Received: 22 November 2017
Revised: 12 January 2018
Accepted: 19 January 2018
First Online: 5 March 2018
Compliance with ethical standards
: The authors adhered to ethical standards.
: The authors declare that they have no conflicts of interest.
: No studies involving human participants or animals were conducted.
: Not applicable.