Relationship of psychological factors with daily activities and quality of life in patients with chronic obstructive pulmonary disease in a Chinese rural population - An, Jing; Zhou, Hui; Yang, Ting; Duan, Changling; Bao, Chenyi; Wan, Chun; Shen, Yongchun; Wen, Fuqiang (Annals of Palliative Medicine, 2020)