1. Second Department of Ophthalmology, Attikon University Hospital, University of Athens, Athens, Greece
2. First Department of Propaedeutic and Internal Medicine, Athens University Medical School, Laiko General Hospital, Athens, Greece
3. Second Department of Internal Medicine, St. Panteleimon General Hospital of Nikaia, Piraeus, Greece
4. Second Department of Neurology, Attikon University Hospital, University of Athens Medical School, Athens, Greece