- Correspondence to Professor Jürgen Braun, Department of Rheumatology, Rheumazentrum Ruhrgebiet, Landgrafenstr. 15, Herne 44652, Germany; j.braunrheumazentrum-ruhrgebiet.de
- Accepted April 1, 2013
- First published May 3, 2013.
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.