Erratum to hydrogen/oxygen mixed gas inhalation improves disease severity and dyspnea in patients with Coronavirus disease 2019 in a recent multicenter, open-label clinical trial - Guan, Wei-Jie; Wei, Chun-Hua; Chen, Ai-Lan; Sun, Xiao-Cong; Guo, Guang-Yun; Zou, Xu; Shi, Jin-Dong; Lai, Pei-Zhen; Zheng, Ze-Guang; Zhong, Nan-Shan (Journal of Thoracic Disease; Vol 12, No 8 (August 20, 2020): Journal of Thoracic Disease, 2020)