1,721,035 research outputs found
Laparoscopic treatment of a solitary fibrous tumour of the greater omentum presenting as spontaneous haemoperitoneun
No full textA 24-year-old man was admitted at the emergency department with a lower quadrant abdominal pain and a slight hypoglycaemia. Abdominal ultrasonography showed the presence of a fluid peritoneal collection and a 3.2 x 2.5 cm hypoisoechogenic mass closed to the left iliac vessels with an echo-color-Doppler pattern similar to that of a hamartoma. CT examination confirmed the hypothesis of a vascular tumour. Although an abdominal angiography added no new information to establish a preoperative diagnosis, it showed a well vascularized mass. The patient underwent laparoscopy that revealed a bleeding mass of the great omentum. Laparoscopic stapled resection of the greater omentum was carried out. The solid lesion consisted of spindle-shaped cells, but no atypical cells were observed. The histological findings were diagnostic of a benign solitary fibrous tumor, an extremely rare neoplasm for a long time considered to be an exclusively thoracic lesion. This is the first case of a solitary fibrous tumor presenting as haemoperitoneum and the first time it was removed laparoscopically. The patient is disease-free at the 2-year follow-up
The liver hemangioma: laparoscopic challenge. -European Association for Endoscopic Surgery
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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
Minimally invasive surgery for the management of major bile duct injury due to cholecystectomy
No full textBackground: In recent years there has been a growing interest in the application of minimally invasive surgery in the management of cholecystectomy-related injury to the biliary tract. The aim of this analysis was to identify and combine the available evidence on the argument, with particular reference to major injuries to the main bile duct requiring biliodigestive anastomosis.
Methods: The PubMed/MEDLINE, Embase, and Web of Science electronic databases were queried through May 2019. Inclusion criteria considered all studies reporting detailed data about patients with bile duct injury following cholecystectomy receiving minimally invasive (both laparoscopic and robotic) surgical repair. Clinical outcomes data were pooled and analyzed.
Results: A total of 31 studies reporting on the outcomes of 218 patients were eventually included in the analysis, whereby 148 patients with type D or E injury. Of these, there were 31 patients (21%) receiving direct bile duct repair and 117 patients (79%) undergoing bilioenteric reconstruction. Among patients with major bile duct injury, postoperative morbidity was 24%, being 12% the incidence of major complications and 6% the rate of patients requiring subsequent, further surgery.
Conclusions: The absence of high-level evidences precludes the possibility to draw definitive conclusions. However, the available data derived from a growing number of centers demonstrate that minimally invasive surgery may offer its well-known advantages on postoperative outcomes also in the setting of severe iatrogenic injury to the bile ducts
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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