Qvarnström, Martin http://orcid.org/0000-0001-7998-2243
Szrek, Piotr http://orcid.org/0000-0001-9855-2003
Ahlberg, Per E. http://orcid.org/0000-0001-9054-2900
Niedźwiedzki, Grzegorz http://orcid.org/0000-0002-4775-5254
Article History
Received: 23 June 2017
Accepted: 15 December 2017
First Online: 18 January 2018
Competing Interests
: The authors declare that they have no competing interests.