1 Department of Rheumatology, Hospital General Universitario Gregorio Marañón, Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM), Madrid, Spain.
2 Department of Rheumatology and Immunology, Medical University of Graz, Graz, Austria.
3 Department of Rheumatology, Hospital Universitario La Paz, Madrid, Spain.
4 Immanuel Krankenhaus Berlin, Medical Center for Rheumatology Berlin-Buch, Berlin, Germany.
5 Department of Rheumatology, Hospital of Bruneck (ASAA-SABES), Teaching Hospital of the Paracelsus Medical University, Brunico, Italy.