Assessment of Five Questionnaires for Chronic Obstructive Pulmonary Disease in a Southern Italian Population: A Proof-of-Concept Study oleh Silvano Dragonieri, Sean Galloway, Vitaliano Nicola Quaranta, Andrea Portacci, Maria Rosaria Vulpi, Carla Santomasi, Agnese Caringella, Giovanna Elisiana Carpagnano