Xiaohong Wang1, Yan Li2, Qing Sun1, Qiang Sun3. 1. Department of Hyperbaric Medicine, No. 401 Hospital of the People's Liberation Army, Qingdao, 266071, China. 2. State Food and Drug Administration of the West Coast New Area, Qingdao, 266555, China. 3. Department of Hyperbaric Medicine, PLA Navy General Hospital, Beijing, 100048, China. sunqiang83@gmail.com.