A new diagnostic method for chronic obstructive pulmonary disease using the photoplethysmography signal and hybrid artificial intelligence. - Engin Melekoglu; Ümit Kocabiçak; Muhammed Kürsad Uçar; Cahit Bilgin; Mehmet Recep Bozkurt; Mehmet Çunkas (PeerJ Comput. Sci., 2022)