Digital analysis of respiratory sounds in healthy patients and patients with chronic obstructive pulmonary disease Journal title: Medycyna Ogólna i Nauki o Zdrowiu Authors: Michał Grzegorczyk, Anna Dubaniewicz, Andrzej Żak , Małgorzata Żak Subject(s): Orthopedics, Health Care Sciences & Services, Medicine, Research & Experimental, Public, Environmental & Occupational Health, Primary Health Care