1. Department of Gastroenterology; Institute of Digestive Diseases, Tongji Hospital, Tongji University School of Medicine; Shanghai China
2. Duke Cancer Institute, Duke University Medical Center; Durham NC
3. Department of Medicine; Duke University School of Medicine; Durham NC
4. Department of Gastroenterology; Shenyang Northern Hospital; Shenyang Liaoning China
5. Department of Epidemiology; School of Public Health, Guangxi Medical University; Nanning Guangxi China
6. Department of Biostatistics and Bioinformatics; Duke University School of Medicine; Durham NC
7. National Engineering Center for Biochip at Shanghai; Shanghai China
8. Department of Population Health Sciences; Duke University School of Medicine; Durham NC