Javanainen, Matti http://orcid.org/0000-0003-4858-364X
Martinez-Seara, Hector http://orcid.org/0000-0001-9716-1713
Vattulainen, Ilpo http://orcid.org/0000-0001-7408-3214
Article History
Received: 1 February 2017
Accepted: 27 March 2017
First Online: 25 April 2017
Competing Interests
: The authors declare that they have no competing interests.