1. University of York; NHS Centre for Reviews and Dissemination; York UK YO10 5DD
2. University of Bristol, Bristol Royal Infirmary; Rheumatology Unit; The Courtyard Marlborough Street Bristol UK BS2 8 HW
3. University of Twente; Department of Communication Studies; Postbus 217 Enschede Netherlands 7500 AE
4. University of Twente; Department of Communication Studies (WMW); Postbus 217 Enschede Netherlands 7500 AE