1. UOSD Special Care Dentistry, Department of Experimental Medicine and Surgery, University of Roma Tor Vergata, 00133 Rome, Italy
2. Unit of Neurology, Department of Systems Medicine, University of Roma Tor Vergata, 00133 Rome, Italy
3. Department of Brain and Behavioral Sciences, University of Pavia, 27100 Pavia, Italy
4. UOSD Special Care Dentistry, University of Rome Tor Vergata, 00133 Rome, Italy
5. Department of Neurosciences, School of Dentistry, Section of Prosthodontics and Digital Dentistry, University of Padova, 35121 Padova, Italy
6. UOSD Special Care Dentistry, Department of Systems Medicine, University of Roma Tor Vergata, 00133 Rome, Italy
7. Parkinson Centre, Department of Systems Medicine, University of Rome Tor Vergata, 00133 Rome, Italy