1. Division of Respiratory and Allergic Diseases, Department of Chest Diseases High Speciality, A. Cardarelli Hospital, Napoli, Italy.
2. University "Federico II", Medical School, Naples, Italy.
3. Division of Allergy, Department of Pediatrics, Nippon Medical School, Tokyo, Japan.
4. First Division of Pneumology, High Speciality Hospital "V. Monaldi" and University "Federico II" Medical School, Naples, Italy.
5. Second Division of Pneumology, High Speciality Hospital "V. Monaldi" and University "Federico II" Medical School, Naples, Italy.
6. Department of Medicine and Surgery, University of Salerno, Salerno, Italy.