Unit of Rheumatology, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy. Unit of Human Anatomy and Histology, Department of Basic Medical Sciences, Neuroscience and Sense Organs, Bari, Italy. Rheumatology Division, University and IRCCS Policlinico S. Matteo Foundation, Pavia, Italy. Rheumatology and Clinical Immunology Unit, Department of Clinical and Experimental Sciences, ASST Spedali Civili and University of Brescia, Brescia, Italy. Service de Physiologie, Unité d'Explorations Fonctionnelles Musculaires, Hôpitaux Universitaires de Strasbourg, Strasbourg, France. Unit of Neurophysiopathology, Department of Basic Medical Sciences, Neuroscience and Sense Organs, University of Bari, Bari, Italy. Clinical Pathology Unit, Department of Biomedical Sciences and Human Oncology, University 'Aldo Moro' of Bari, Bari, Italy. Institute of General Surgery 'G Marinaccio', Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy. Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy.