1. Department of Internal Medicine 3, Friedrich Alexander University Erlangen-Nuremberg and Universitatsklinikum Erlangen, Erlangen, Germany
2. Division of Clinical Rheumatology, ASST Gaetano Pini-CTO Institute, Milan, Italy
3. Department of Clinical Sciences & Community Health, Research Center for Adult and Pediatric Rheumatic Diseases, Università Degli Studi Di Milano, Milano, Italy