1. Department of Clinical Laboratory , Tianjin Medical University General Hospital , Tianjin , P.R. China
2. Department of Anesthesia , Tianjin Medical University General Hospital , Tianjin , P.R. China
3. Department of Medical Laboratory , Tianjin Medical University , Tianjin , P.R. China
4. Department of Traditional Chinese Medicine , Chengde Medical College , Chengde , P.R. China