1. Department of Gastrointestinal Surgery The Second Hospital of Hebei Medical University Shijiazhuang China
2. Department of Cardiology The No. 1 Hospital of Shijiazhuang China
3. Department of General Surgery The Fourth Hospital of Hebei Medical University Shijiazhuang China
4. Hebei Medical University Shijiazhuang China
5. The Forth Department of General Surgery Hebei General Hospital Shijiazhuang China