- Correspondence to Dr Paula Mikkonen, Department of Physical and Rehabilitation Medicine, University of Oulu, Oulu University Hospital, Box 21, Oulu 90029, Finland;
- Accepted October 6, 2011
- First published November 22, 2011.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.