1. Department of Gastroenterology; Shanghai Ninth People's Hospital; Shanghai Jiaotong University; School of Medicine; Shanghai China
2. Division of Gastroenterology and Department of Internal Medicine; Veterans Administration Medical Center; Detroit Michigan USA
3. Wayne State University School of Medicine; Detroit Michigan USA
4. Department of Pathology; Shanghai Ninth People's Hospital; Shanghai Jiaotong University; School of Medicine; Shanghai China
5. Karmanos Cancer Institute; Detroit Michigan USA