- Correspondence to Dr Ulrich A Walker, Department of Rheumatology, University Hospital Basel, Petersgraben 4, 4031 Basel, Switzerland;
- Received January 8, 2015
- Revised May 15, 2015
- Accepted July 13, 2015
- First published July 31, 2015.
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.