1 Unit of Internal Medicine and Geriatrics, Respiratory Pathophysiology and Thoracic Endoscopy, Fondazione Policlinico Campus Bio Medico University Hospital, Rome, Italy.
2 Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy.
3 Gastroenterology Unit, Fondazione Policlinico Campus Bio Medico University Hospital, Rome, Italy.