Hydrogen/oxygen therapy for the treatment of an acute exacerbation of chronic obstructive pulmonary disease: results of a multicenter, randomized, double-blind, parallel-group cont... oleh Ze-Guang Zheng, Wu-Zhuang Sun, Jie-Ying Hu, Zhi-Jun Jie, Jin-Fu Xu, Jie Cao, Yuan-Lin Song, Chang-Hui Wang, Jing Wang, Hui Zhao, Zhong-Liang Guo, Nan-Shan Zhong