© 2014 Kesäniemi et al.; licensee BioMed Central Ltd. 


This is an Open Access article distributed under the terms of the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver applies to the data made available in this article, unless otherwise stated.
Ellei muuten mainita, aineiston lisenssi on © 2014 Kesäniemi et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver applies to the data made available in this article, unless otherwise stated.