1. Second Department of Internal Medicine, Attikon University Hospital, Medical School, National and Kapodistrian University of Athens, 12462 Athens, Greece
2. Department of Vascular Surgery, Attikon University Hospital, 12462 Athens, Greece
3. Hellenic Cord Blood Bank, Biomedical Research Foundation Academy of Athens, 11527 Athens, Greece
4. First Department of Propaedeutic Internal Medicine, Diabetes Centre, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
5. Health and Social Care Management, University of West Attica, 12241 Athens, Greece
6. Sector of Medicine, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece