Assessing the impact of diverse mask types on COPD patients: a randomised controlled trial study protocol
Xuwen Chen, Xiaomei Jiang, Xuhui Zhang, Dong Ren, Caihong Wei, Aihong Xu, Hong Yang, Ruijia Bai, Caiyun Li, Feiyan Yue, Shisan Bao, Jungang Shi, Jingchun Fan
BMJ Open Jan 2024, 14 (1) e080721; DOI: 10.1136/bmjopen-2023-080721