1. Department of Laboratory Medicine, Qingdao Central Hospital , Second Affiliated Hospital of Qingdao University , Siliunan Road #127 , Qingdao , 266042 P.R. China
2. Department of Laboratory Medicine , Qingdao Eight People Hospital , Qingdao , P.R. China
3. Department of Laboratory Medicine, Shandong Provincial Qianfoshan Hospital , Shandong University , Jinan , P.R. China