1. Allergy Research Laboratory; 2nd Pediatric Clinic; University of Athens; Athens Greece
2. Allergy Unit; 2nd Department of Dermatology and Venereology; Medical School; ‘Attikon’ General University Hospital; Athens Greece
3. Department of Pediatrics; Medical School; University of Ioannina; Ioannina Greece
4. Pediatric Respiratory and Allergy Unit; 3rd Department of Pediatrics; Medical School; ‘Attikon’ General University Hospital; Athens Greece