1 Section of Neurology - Lab of Clinical Neurochemistry, Dept of Medicine and Surgery, University of Perugia, Italy. Electronic address: lucilla.parnetti@unipg.it.
2 Section of Neurology - Lab of Clinical Neurochemistry, Dept of Medicine and Surgery, University of Perugia, Italy.
3 Parkinson's Disease & Movement Disorders Unit, Neurology Service, Hospital Clínic i Universitari de Barcelona, IDIBAPS, CIBERNED (CB06/05/0018-ISCIII), ERN- RND, InstitutClínic de Neurociències UBNeuro (Maria de Maeztu Excellence Centre), Universitat de Barcelona, Barcelona, Catalonia, Spain.