Hakala, Mikko http://orcid.org/0000-0003-2829-4736
Kronberg, Rasmus http://orcid.org/0000-0002-6257-5956
Laasonen, Kari http://orcid.org/0000-0002-4419-7824
Article History
Received: 18 May 2017
Accepted: 31 October 2017
First Online: 10 November 2017
Competing Interests
: The authors declare that they have no competing interests.