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Prolonged esophageal transit during wireless capsule endoscopy: A series of five cases and analysis of risk factors 
Journal:Journal of Clinical Gastroenterology
Repeat-screening colonoscopy 5 years after normal baseline-screening colonoscopy in average-risk chinese: A prospective study
Journal:American Journal of Gastroenterology
What kind of formal language knowledge do non-native speaker teachers need?
Proceeding/Conference:International Conference of the Association for Language Awareness, ALA 2008