© 2014 Elsevier Ltd.  Open access under CC BY-NC-ND license. 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 in 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 Elsevier Ltd. Open access under CC BY-NC-ND license. 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 in properly cited. The Creative Commons Public Domain Dedication waiver applies to the data made available in this article, unless otherwise stated.