1. Allergy Department, “Sotiria” Athens General Hospital, Athens, Greece
2. Allergy Department, Naval Hospital of Athens, Athens, Greece
3. Allergy Unit, 2nd Department of Dermatology and Venereology, Medical School, National and Kapodistrian University of Athens, “Attikon” University Hospital, Athens, Greece
4. 3rd Department of Medicine, Medical School, National and Kapodistrian University of Athens, “Sotiria” Athens General Hospital, Athens, Greece