Article History
Received: 8 January 2018
Accepted: 10 January 2018
First Online: 19 January 2018
Compliance with ethical standards
:
: Gunnhildur Gudnadottir declares that she has no conflict of interest. Joacim Stalfors declares that he has no conflict of interest. Johan Hellgren declares that he has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.