1. Department of System Medicine UOSD Parkinson Center University of Rome “Tor Vergata” Fondazione Policlinico Tor Vergata viale Oxford 81 Rome 00133 Italy
2. Azienda Ospedaliera CTO Rome Italy
3. Department of Physiology and Biochemistry Faculty of Medicine and Surgery University of Malta La Valletta Malta
4. Movement disorders service Neurocenter of Southern Switzerland Lugano Switzerland