Learn More
BACKGROUND & AIMS Chronic hepatitis B virus (HBV) infection is an important cause of cirrhosis and hepatocellular carcinoma worldwide; populations that migrate to the United States and Canada might be affected disproportionately. The Hepatitis B Research Network (HBRN) is a cooperative network of investigators from the United States and Canada, created to(More)
BACKGROUND Alveolar ridge keratosis (ARK) is not widely recognized as a distinct clinicopathologic entity, and it often is included in studies of oral leukoplakia (OL), thereby implying premalignant potential. The authors' objectives were to characterize the clinicopathologic features of ARK and determine whether removing ARK from the OL category would(More)
BACKGROUND Several recent reports suggest an increasing incidence of oral squamous cell carcinoma (OSCC) among young persons in many regions of the world--a trend which is particularly concerning given the overall stabilization or even decline in incidence rates for head and neck cancer in general. The aim of this study is to determine whether there has(More)
OBJECTIVE To determine whether ultrasound (US) increases successful central venous catheter (CVC) placement, decreases site attempts, and decreases CVC placement complications. DESIGN AND SETTING A prospective observational cohort study evaluating a transition by the Pediatric Critical Care Medicine service to US-guided CVC placement. Medical and surgical(More)
Mixture risk assessment is often hampered by the lack of dose-response information on the mixture being assessed, forcing reliance on component formulas such as dose addition. We present a four-step approach for evaluating chemical mixture data for consistency with dose addition for use in supporting a component based mixture risk assessment. Following the(More)
OBJECTIVES To investigate the association between emphysema heterogeneity in spatial distribution, pulmonary function and disease severity. METHODS AND MATERIALS We ascertained a dataset of anonymized Computed Tomography (CT) examinations acquired on 565 participants in a COPD study. Subjects with chronic bronchitis (CB) and/or bronchodilator response(More)
Previously, we reported that acute treatment with propoxur or carbaryl decreased the duration of the photic after discharge (PhAD) of flash evoked potentials (FEPs). In the current studies, we compared the effects of acute or repeated exposure to a mixture of carbaryl and propoxur (1:1.45 ratio; propoxur:carbaryl) on the duration of the PhAD and brain ChE(More)
An important goal of censored quantile regression is to provide reliable predictions of survival quantiles, which are often reported in practice to offer robust and comprehensive biomedical summaries. However, formal methods for evaluating and comparing working quantile regression models in terms of their performance in predicting survival quantiles have(More)
Semi-competing risks data frequently arise in biomedical studies when time to a disease landmark event is subject to dependent censoring by death, the observation of which however is not precluded by the occurrence of the landmark event. In observational studies, the analysis of such data can be further complicated by left truncation. In this work, we study(More)
Conventional agreement studies have been confined to addressing the sense of reproducibility, and therefore are limited to assessing measurements on the same scale. In this work, we propose a new concept, called "broad sense agreement," which extends the classical framework of agreement to evaluate the capability of interpreting a continuous measurement in(More)