1. 2nd Department of Internal Medicine, General and Oncology Hospital of Kifissia “Agioi Anargyroi”, Athens, Greece
2. 1st Department of Propedeutic Internal Medicine, Laikon General Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
3. Department of Health Economics, School of Health Sciences, National and Kapodistrian University of Athens, Athens, Greece