Characteristics of Chronic Obstructive Pulmonary Disease Patients with Pulmonary Hypertension Assessed by Echocardiography in a Three-Year Observational Cohort Study by Nakayama S, Chubachi S, Sakurai K, Irie H, Tsutsumi A, Hashiguchi M, Itabashi Y, Murata M, Nakamura H, Asano K, Fukunaga K

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