1. Postdoctoral Research Station of Qingdao University, Qingdao, Shandong 266071, P.R. China
2. Department of Cardiothoracic Surgery, 401 Hospital of People's Liberation Army, Qingdao, Shandong 266071, P.R. China
3. Department of Hyperbaric Medicine, 401 Hospital of People's Liberation Army, Qingdao, Shandong 266071, P.R. China
4. Department of General Surgery, 401 Hospital of People's Liberation Army, Qingdao, Shandong 266071, P.R. China