1. Unit of Epidemiology and Medical Statistics Department of Diagnostics and Public Health University of Verona Verona Italy
2. Unit of Respiratory Diseases Department of Internal Medicine University of Verona Verona Italy
3. Long‐term care Unit Fracastoro Hospital ‐ ULSS 9 Verona Italy
4. Department of Public Health and Pediatrics University of Turin Turin Italy
5. Division of Respiratory Diseases Istituto di Ricovero e Cura a Carattere Scientifico “San Matteo” Hospital Foundation University of Pavia Pavia Italy
6. Department of International Health Johns Hopkins Bloomberg School of Public Health Baltimore Maryland
7. Institute of Respiratory Diseases University of Sassari Sassari Italy