1. Department of General Surgery, The First Affiliated Hospital, Hebei Medical University, Shijiazhuang, China
2. Department of Endocrinology, The Fourth Affiliated Hospital, Hebei Medical University, Shijiazhuang, China
3. Department of Pathology, The Fourth Affiliated Hospital, Hebei Medical University, Shijiazhuang, China
4. Department of General Surgery, The Fourth Affiliated Hospital, Hebei Medical University, Shijiazhuang, China.