1. Institute of Experimental Musculoskeletal Medicine, University Hospital Muenster, 48149 Muenster, Germany.
2. Institute of Immunology, University Hospital Jena, 07743 Jena, Germany.
3. Novartis Institutes for BioMedical Research, 4002 Basel, Switzerland.
4. Nijmegen Centre for Molecular Life Sciences, 86525 Nijmegen, Netherlands.