1. WA Steiner, PhD, is Scientific Collaborator, Department of Rheumatology and Institute of Physical Medicine, University Hospital Zurich, Gloriastrasse 25, CH-8091 Zurich, Switzerland.
2. L Ryser, lic phil, is Psychologist, Department of Rheumatology and Institute of Physical Medicine, University Hospital, Zurich, Switzerland
3. E Huber, MHSA, is Clinical Leader of Physiotherapy and Occupational Therapy, Department of Rheumatology and Institute of Physical Medicine, University Hospital, Zurich, Switzerland
4. D Uebelhart is Privatdozent, University of Geneva, and Leading Physician, Department of Rheumatology and Institute of Physical Medicine, University Hospital, Zurich, Switzerland
5. A Aeschlimann, is Professor, Rheumatology and Rehabilitation Clinic, Zurzach, Switzerland
6. G Stucki, is Professor, Department of Physical Medicine and Rehabilitation, University of Munich, Munich, Germany