- Correspondence to Professor Markku Hakala, Division of Rheumatology, Department of Medicine, Rehabilitation Center, Päijät-Häme Central Hospital, Keskussairaalankatu 7, Lahti 15850, Finland;
- Received February 7, 2013
- Revised May 14, 2013
- Accepted June 29, 2013
- First published July 12, 2013.
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