1. Department of Gastroenterology; Henan Provincial People's Hospital; Zhengzhou University; Zhengzhou China
2. Department of Pathology and MCW Cancer Center; Medical College of Wisconsin; Milwaukee WI USA
3. Department of Oncology; Tongji Hospital of Tongji Medical College; Huazhong University of Science and Technology; Wuhan China
4. Physical Examination Center; Zhengzhou Seventh People's Hospital; Zhengzhou China
5. Department of Biostatistics; University of Wisconsin; Milwaukee WI USA
6. Department of Oncology; Mayo Clinic; Rochester MN USA