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We study the problem of web search result diversification in the case where intent based relevance scores are available. A diversified search result will hopefully satisfy the information need of users who may have different intents. In this context, we first analyze the properties of an intent-based metric, ERR-IA, to measure relevance and diversity(More)
BACKGROUND & AIMS Limited endoscopic sphincterotomy with large balloon dilation (ESBD) is an alternative to endoscopic sphincterotomy (ES) for removing bile duct stones, but it is not clear which procedure is most effective. We compared the 2 techniques in removal of bile duct stones. METHODS Between September 2005 and September 2011, 156 consecutive(More)
Recent 16S ribosomal RNA gene (rRNA) molecular profiling of the stomach mucosa revealed a surprising complexity of microbiota. Helicobacter pylori infection and non-steroidal anti-inflammatory drug (NSAID) use are two main contributors to gastritis and peptic ulcer. However, little is known about the association between other members of the stomach(More)
BACKGROUND Guidelines on pain management recommend that patients at risk of ulcers receive either a cyclo-oxygenase (COX 2) inhibitor or a non-steroidal anti-inflammatory drug (NSAID) with a proton-pump inhibitor (PPI). These two treatments have similar effectiveness, but they are insufficient for protection of patients at very high risk for ulcer bleeding.(More)
BACKGROUND Phenotypic evolution of Crohn's disease occurs in whites but has never been described in other populations. The Montreal classification may describe phenotypes more precisely. The aim of this study was to validate the Montreal classification through a longitudinal sensitivity analysis in detecting phenotypic variation compared to the Vienna(More)
OBJECTIVES Although colonoscopy is considered the most accurate screening tool for colorectal neoplasm, the optimal interval of repeating a screening colonoscopy, particularly in average-risk subjects after a negative colonoscopy, is poorly defined. We determine the 5-year risk of advanced neoplasia on rescreening colonoscopy in a cohort of average-risk(More)
BACKGROUND AND AIMS Capsule endoscopy (CE) is one of the widely accepted investigations for obscure gastrointestinal bleeding (OGIB), but little is known about the impact of CE on the long-term outcome of patients with OGIB. We studied the long-term outcome of patients with OGIB after CE examination. PATIENTS AND METHODS Forty-nine consecutive patients(More)
BACKGROUND Hemoclips, injection therapy and thermocoagulation (heater probe or electrocoagulation) are the most commonly used types of endoscopic hemostasis for the control of non-variceal gastrointestinal bleeding. AIM To compare the efficacy of hemoclips versus injection or thermocoagulation in endoscopic hemostasis by pooling data from the literature.(More)
We aimed to investigate the impact of hepatitis B virus (HBV) DNA on the development of hepatocellular carcinoma (HCC). We conducted a case/control study based on 506 chronic HBV patients followed up since 1997. Forty-one patients developed HCC, and each of them was age and gender matched with two simultaneously recruited controls without HCC. HBV DNA was(More)
BACKGROUND & AIMS The long-term prognosis of peptic ulcers associated with neither Helicobacter pylori nor nonsteroidal anti-inflammatory drugs (NSAIDs) is unknown. METHODS This 7-year prospective cohort study recruited patients with bleeding ulcers from January to December 2000. H pylori-negative idiopathic bleeding ulcers were defined as having tested(More)