1. Department of Neurology and Psychiatry; Sapienza University; Rome Italy
2. Physical Medicine and Rehabilitation Division; Policlinico Umberto I; Sapienza University; Rome Italy
3. Division of Neurological Pain Research and Therapy; Universitätsklinikum Schleswig-Holstein; Kiel Germany
4. Division of Medical Genetics; Department of Molecular Medicine; San Camillo-Forlanini Hospital; Sapienza University; Rome Italy
5. Rheumatology Unit; Department of Internal Medicine and Medical Specialities; Sapienza University; Rome Italy