Physical activity among adults with chronic obstructive pulmonary disease in Spain (2014-2020): Temporal trends, sex differences, and associated factors. - Llamas-Saez C; Saez-Vaquero T; Jiménez-García R; López-de-Andrés A; Carabantes-Alarcón D; Zamorano-León JJ; Cuadrado-Corrales N; Omaña-Palanco R; de Miguel Diez J; Pérez-Farinos N (Respiratory medicine, 2023)