1,720,958 research outputs found
Gluten intolerance: Gender- and age-related differences in symptoms
No full textObjective. Gluten intolerance is a common, immunologically mediated disorder with a widely variable clinical presentation that affects genetically predisposed subjects. Women seem to be more frequently affected although data on sex differences are poor. In this study the prevalence of different clinical pictures according to sex and age is analysed in a large series of patients. Material and methods. A total of 1436 patients with gluten intolerance were retrospectively considered, diagnosed from January 1975 to August 2001 based on compatible small-bowel biopsy and response to a gluten-free diet, plus immunofluorescent detection of granular IgA in papillary derma for dermatitis herpetiformis. The clinical picture at onset (classic, non-classic, silent) and age at diagnosis ((less-than or equal to) 2 years, > 2 and (less-than or equal to) 14 years, > 14 years) was recorded; 362 parents of coeliac probands undergoing a familial screening were also studied. The relations among sex, age class and symptoms were analysed using the (chi)2 test with Yates's correction. Results. The overall female/male ratio was 2.3:1 but the inter-sex difference was significant only when the diagnosis was made in adulthood where a significant association between iron-deficiency anaemia as manifestation at onset in adult women (34% versus 7%) was found. Low weight, dyspepsia and hypertransaminasaemia were more common in adult men than women (20%, 14% and 7% versus 13%, 3% and 2%, respectively). Dermatitis herpetiformis was present more frequently in men (16% versus 9%). The prevalence of silent cases was 6% in men and 3% in women. Familial screening showed the same prevalence (9.3%) of current coeliac disease in fathers and mothers. Conclusions. Diagnosis of coeliac disease is more frequent in women but physicians' awareness of sex- and age-related differences in clinical presentation could improve diagnostic performances in men
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Silent celiac disease is frequent in the siblings of newly diagnosed celiac patients
No full textBackground/Aims: Celiac disease is caused by environmental and genetic factors, and the relatives of celiac patients are at higher risk of developing celiac disease than the general population. This prospective study evaluates the prevalence of celiac disease in the asymptomatic siblings of celiac patients. Methods: Forty-eight siblings (22 males; mean age 13 years) of 39 celiac children (20 males; mean age 4 years), and 120 siblings (55 males; mean age 33 years) of 55 adult celiac patients (12 males; mean age 31 years) were serologically screened for celiac disease. Positive cases were considered for endoscopic duodenal biopsies. Results: Forty of the 168 asymptomatic siblings (23.8%) were affected by celiac disease. There were no differences between the index cases with and without affected siblings in terms of age at diagnosis, symptoms at onset, order of birth, associated disorders or other affected relatives. The male siblings of pediatric patients were affected in 40.9% of cases and female siblings in 26.9%; the corresponding figures for adults were 16.4 and 23.1%. Conclusions: Silent celiac disease is 24-48 times more frequent in the siblings of celiac patients than in the general population. No predictive factors for sibling involvement were found. Adult females seem to tolerate gluten less than adult males. Copyrigh
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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