Association between 6-min walk test and initiation of home oxygen therapy within 3 years in chronic obstructive pulmonary disease managed by primary care physicians. - Muraoka H; Tsuburai T; Komase Y; Tanaka S; Moriuchi A; Kaneko S; Nishida M; Shibuya Ueno J; Matsushima A; Shinozaki Y; Nishiyama K; Nishi Y; et al. (Respiratory medicine, 2025)