1. 1 Department of Neurology, Eginition Hospital, National and Kapodistrian University of Athens, Athens, Greece
2. Nuclear Medicine Unit, Attikon Hospital, Athens, Greece
3. Neurology Clinic, Henry Dunan Hospital, Athens, Greece
4. 2 Department of Neurology, Attikon Hospital, National and Kapodistrian University of Athens, Athens, Greece
5. Neurology Clinic, Philipps University, Marburg, Germany
6. Parkinsons disease and Movement Disorders Dept., HYGEIA Hospital, Athens, Greece