1. Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany
2. Department of Rheumatology, Sapienza University of Rome, Rome, Italy
3. Department of Radiology, Bruneck Hospital, Bruneck, Italy
4. Department of Internal Medicine, Bruneck Hospital, Bruneck, Italy
5. Department of Rheumatology, Assistance Publique–Hôpitaux de Paris Saint-Antoine and Pierre and Marie Curie University, Paris, France
6. Department of Rheumatology, Universite Paris Ouest-Versailles-Saint Quentin en Yvelines, Paris, France
7. Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria