Ribeiro, S.; Cardoso, C. S.; Valério, M.; Machado, J.; Costa, J.; Rodrigues, C.; Rebelo-Marques, A. Confirmatory Evaluation of the Modified Medical Research Council Questionnaire for Assessment of Dyspnea in Patients With Chronic Obstructive Pulmonary Disease in Portugal. Acta Med Port 2022, 35, 89-93.