1. Sleep Research Unit, First Department of Psychiatry, National and Kapodistrian University of Athens, 11528 Athens, Greece
2. Sleep-Wake-Epilepsy Center, Department of Neurology, University Hospital (Inselspital), University of Bern, 3010 Bern, Switzerland
3. Department of Neurology, Medical School, University of Cyprus, Nicosia 1678, Cyprus
4. Second Department of Neurology, “Attikon” University Hospital, School of Medicine, National and Kapodistrian University of Athens, 12462 Athens, Greece
5. Sleep Lab, First ICU Clinic, Evangelismos Hospital, 10675 Athens, Greece