1. 4th Department of Internal Medicine; University Hospital Attikon; National and Kapodistrian University of Athens Medical School; Athens Greece
2. Department of Cytopathology; University Hospital Attikon; National and Kapodistrian University of Athens Medical School; Athens Greece
3. Hellenic Pasteur Institute; Athens; Greece
4. 3rd Department of Pediatrics; University Hospital Attikon; National and Kapodistrian University of Athens Medical School; Athens Greece