Efficacy and safety of pulmonary rehabilitation training on lung function, quality of life, and T cell immune function in patients with stable chronic obstructive pulmonary disease: a randomized controlled trial - Ma, Ya; Chen, Yan; Zhang, Nan; Xu, Guangqing; Wang, Yinglan; Sun, Yan; Bai, Cuiqing; Zuo, Zhitong (Annals of Palliative Medicine; Vol 11, No 5 (May 27, 2022): Annals of Palliative Medicine, 2022)