1,720,956 research outputs found
Cutaneous vasculitis and inflammatory bowel diseases
No full textExtraintestinal manifestations occur in up to 40% of patients living with inflammatory bowel disease (IBD) and may precede the onset of gastrointestinal symptoms by many years. Vasculitides are considered rare cutaneous manifestations, but they often represent an important cause of morbidity and a relevant diagnostic issue in IBD. In addition, the increasing use of biological therapies for IBD may also play a pivotal role in the development of vascular disorders of different type. Hence, we provide a complete and in-depth review of the main features of cutaneous vasculitides observed in IBD, with a specific focus on their clinical presentation and possible pathophysiological mechanisms
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
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
Merkel cell carcinoma: a systematic review of ENT presentations.
No full textThe aim of this study was to perform a systematic literature review of Merkel cell carcinomas (MCCs) originating exclusively in the ear, nose and throat (ENT) district. An appropriate string was run on PubMed to retrieve articles dealing with ENT presentations of MCC. A double cross-check was performed on citations and full-text articles found using the selected inclusion and exclusion criteria. In total, 43 articles were finally included in the study, describing 51 cases of MCC involving the ENT region: 22/51 (43%) cases involving the ear; 20/51 (39%) cases involving the mucosal sites; 9/51 (18%) cases involving other ENT regions. Patients with mucosal site involvement showed a higher mortality rate from the disease (45%) in comparison with the other two groups, especially when compared with those patients having primary involvement of the ear (22%). The ENT specialist should suspect and consider MCC, especially in elderly patients presenting with a suspicious lesion of the auricular pavilion, so as to avoid misdiagnosis and delayed treatments
Linear and whorled nevoid hypermelanosis in a 6 year old boy
Full text linkA case of linear and whorled nevoid hypermelanosis with multisystem malformations in a 6 year old boy was reported. The Authors discussed the differential diagnosis and the chromosome, pathological and ultramicroscopy alterations of the patient
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