Hafstein, Sigurdur Freyr http://orcid.org/0000-0003-0073-2765
Valfells, Asgeir
Funding for this research was provided by:
Icelandic Research fund (130677-051)
Article History
Received: 30 May 2018
Accepted: 10 December 2018
First Online: 18 December 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.