1. Department of Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
2. Department of Gastrointestinal Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
3. Maryland University School of Medicine, Baltimore, MD 21201, USA
4. Department of Anatomy, College of Basic Medical Sciences, Zhengzhou University, Henan 450000, China
5. The Johns Hopkins University, Baltimore, MD 21218, USA