1. Department of Special Medicine, Medical College, Qingdao University, Qingdao, Shandong 266071, P.R. China
2. Department of Clinical Medicine, Medical College, Qingdao University, Qingdao, Shandong 266071, P.R. China
3. Department of Hyperbaric Medicine, Hospital of Chinese People's Liberation Army, Qingdao, Shandong 266072, P.R. China
4. Department of Nephrology, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266005, P.R. China