1 Division of Respiratory and Allergic Diseases, Department of Chest Diseases, High Speciality A. Cardarelli Hospital, Naples, Italy. Electronic address: gdamatomail@gmail.com.
2 Epidemiology of Allergic and Respiratory Diseases Department (EPAR), Pierre Louis Institute of Epidemiology and Public Health (IPLESP UMRS1136), UPMC Univ Paris 06, INSERM, Saint-Antoine Medical School, Sorbonne Universités, Paris, France.
3 First Division of Pneumology, High Speciality Hospital "V. Monaldi" and University "Federico II" Medical School Naples, Naples, Italy.
4 Department of Medicine and Surgery, University of Salerno, Salerno, Italy.