1,720,964 research outputs found
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
Systematic review and meta-analysis of incidence, indications, and outcomes of early open conversions after EVAR for abdominal aortic aneurysms
No full textIntroduction: The purpose of this study is to report incidence, indications, and outcomes of early open conversions (EOC) after endovascular aortic repair (EVAR), defined as surgical conversion performed within 30 days from the initial EVAR. Evidence aquisition: A systematic review of the literature was performed (database searched: PubMed, Web of Science, Scopus, Cochrane Library; last search April 2023). Articles reporting EOC after EVAR comprising at least five patients were included. Meta-analyses of proportions were performed using a random-effects model. Evidence synthesis: Seventeen non-randomized studies, published between 1999 and 2022, were included. A total of 35,970 patients had previously undergone EVAR, of these 438 patients underwent EOC. Estimated incidence of EOC was 1.4% (95% CI 1.1-1.4; I2=81.66%). Specifically, in the works published before 2010 the incidence was 1.8% (95% CI 1.3-2.4; I2=74.25) while for subsequent ones it was 0.9% (95% CI 0.6-1.1; I2=69.82). Weighted mean age was 74.91 years (95% CI 72.42-77.39; I2=83.11%). Estimated rate of cause determining EOC were: access issue in 27.7% of patients (95% CI 13.8-41.6; I2=88.14%), incorrect placement of the endograft in 20.1% (95% CI 10.2-30.0; I2=76,9%), problems with "delivery system" in 9.0% (95% CI 4.9-13.1; I2=0%), aorto-iliac rupture in 8.6% (95% CI 4.5-12.6; I2=0%), endoprosthesis migration in 7.9% of cases (95% CI 3.3-12.4; I2=22.96%), failure in engaging the contralateral gate in 4.8% (95% CI 1.6-8; I2=0%), "kinking" or "twisting" of endoprosthesis in 3.3% (95% CI 0.6-5.9; I2=0%), graft thrombosis in 3.2% (95% CI 0.6-5.7; I2=0%), type Ia endoleak in 2.9% (95% CI 0.4-5.4; I2=0%), type III endoleak in 2.8% (95% CI 0.3-5.3; I2=0%) and endograft infection in 2.7% (95% CI 0.3-5.2; I2=0%). Intraoperative conversion rate was 91.1% (95% CI 85.8-96.4; I2=66.01%). Early mortality rate after EOC was 14.5% (95% CI 9.1-19.9; I2=48.31%). Mean length of stay (LOS) was 11.94 days (95% CI 6.718-17.172; I2=92.34%). Conclusions: The incidence of EOC seems to decrease over time. Causes of EOC were mainly related to access problems and incorrect positioning of the endograft. Most of the EOC were performed intraoperatively carrying a high mortality rate
Endovascular Treatment of Abdominal Aorto-Caval Fistula With Occluder Devices: Case Report and Systematic Literature Review
No full text: Aortocaval fistula (ACF) is a life-threatening condition secondary to abdominal aortic aneurysms (AAA) rupture or previous trauma/intervention. The treatment of ACF by an occluder device deployment is a rare but increasingly common approach. We report a case of ACF secondary to ruptured AAA treated with an occluder device after endograft deployment. A 66-year-old male was treated in an emergent setting for a ruptured AAA with ACF deploying aorto-bi-iliac endograft. At 3-month computed tomography angiography (CTA), the persistence of aorto-caval communication and the increased sac reperfusion (type II endoleak) from the lumbar and inferior mesenteric artery were detected. Under local anesthesia and through percutaneous left brachial arterial access and percutaneous right femoral venous access, a 7-mm Amplatzer Septal Occluder was deployed with the "left" atrial end in the aneurysmal sac and the "right" atrial end in the inferior vena cava. The adjunctive embolization of the aneurysmal sac was performed. The post-procedural CTA and 6-month contrast-enhanced ultrasound confirmed the disappearance of endoleak and the exclusion of ACF. A systematic review of the literature according to the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) statement was conducted regarding the use of occluder devices to treat ACF (PROSPERO; CRD42024512167). Including the current case, 10 patients (male 100%; age range 24-74 years) in 10 publications were found. ACF after trauma and after AAA rupture was described in 6 and 4 patients, respectively. Occluder device deployment was a primary procedure in 6/10 cases and a secondary intervention in 4/10 cases. Different types of occluder devices (vascular 4/10, atrial septal 3/10, duct 2/10, ventricular septal 1/10) were used. Technical success was 100%, with no intraoperative complications. Postoperative complications occurred in 2/10 patients (vascular plug migration and iliac deep vein thrombosis). Three out 10 patients required reintervention within 30 days for persistent patency of ACF (1 endovascular abdominal aneurysm repair, 1 re-embolization of fistula with coils, 1 patient underwent adjunctive septal occluder device and iliolumbar embolization). In 8/10 patients (length of follow-up: 1-80 months), no residual arterio-venous communication. In 3 patients with AAA, aneurysm shrinkage occurred in 3/3 patients, with type II endoleak in 1 case. Although a scarce number of patients are available in the literature, occluder device deployment into abdominal arterio-venous fistula is feasible. For a traumatic ACF, the occluder device deployment could be proposed as the primary treatment, while, after a ruptured AAA, endograft deployment is mandatory.Clinical ImpactThe use of occluder device for the occlusion of an aorto-caval fistula (ACF) is an off-label technique reported in literature. The technical success mainly depends from the type of deployed occluder device. This treatment should be proposed as first approach in post-traumatic ACF without aneurysms; in case of aneurysmal rupture treated with endograft, the occluder device placement should be considered for persistent endoleak from inferior vena cava
Influence of stent-graft fabrics on aortic stiffness after EVAR: preliminary results of a prospective cohort-study
No full textDispelling 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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