1. Second Department of Psychiatry, University of Athens, ‘ATTIKON’ University Hospital, 12462 Athens, Greece
2. Department of Cardiology, Asklepeion General Hospital, 16673 Athens, Greece
3. 1st Department of Paediatrics, University of Athens, Aghia Sophia Children's Hospital, 11527 Athens, Greece
4. 2nd Department of Propaedeutic Surgery, National and Kapodistrian University of Athens School of Medicine, 11527 Athens, Greece
5. Laboratory of Clinical Virology, School of Medicine, University of Crete, 71003 Heraklion, Greece
6. Neurology Department, Evexia Rehabilitation Centre, 63080 Chalkidiki, Greece