1. Department of Hematology, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
2. Anorectal Department, Shenyang Anorectal Hospital, Shenyang, Liaoning 110054, P.R. China
3. Intensive Care Unit, The Fourth Affiliated Hospital of China Medical University, Shenyang, Liaoning 110032, P.R. China