1. Department of General Surgery, Tongji University School of Medicine, Yangpu Hospital, Shanghai, China.
2. Medical Department of Hebei University, Hebei University, Baoding, China.
3. Department of Neurology, The First Affiliated Hospital of Hebei North University, Zhangjiakou, China.
4. Department of General Surgery, The Second Hospital of Hebei Medical University, Shijiazhuang, China.
5. Department of General Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, China.