1. Medical Research Center, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
2. Department of Cardiovascular Medicine, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
3. Clinical Laboratory and Central Laboratory, The Affiliated Qingdao Hiser Hospital of Qingdao University, Qingdao, Shandong 266033, P.R. China