1,721,002 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
Three-dimensional power Doppler sonography in the diagnosis of arteriovenous malformation of the uterus
No full textPrenatal imaging of facial clefts by magnetic resonance imaging with emphasis on the posterior palate
No full textObjective: To evaluate the role of Magnetic Resonance Imaging (MRI) in the prenatal diagnosis of facial clefts. Materials and Methods: Six fetuses with a sonographic diagnosis of cleft lip and palate underwent MRI at a median age of 30 weeks (range 28-32). The defect was bilateral in two cases. Results: Fetal MRI confirmed the presence of a cleft involving at least the anterior palate in all cases. Distinction between unilateral and bilateral clefts could be made in all cases and was always confirmed after birth. Sagittal views of the fetal face were found to be particularly useful in identifying the degree of extension of the cleft into the palate. The diagnosis was confirmed after birth. Conclusion: Our results suggest that MRI may be ancillary to ultrasound in prenatal investigation of a fetus with cleft lip, allowing a better staging of the lesion by demonstrating the degree of involvement of the palate
Premature rupture of the membranes in twin pregnancies: Maternal and fetal outcomes
Full text linkAim: To analyse outcomes of twin pregnancies complicated by membranes rupture between 24 and 37 weeks of gestation. Methods: Retrospective matched cohort study on twin pregnancies with premature membranes rupture, through review of clinical records at the Policlinico S. Orsola di Bologna, a tertiary hospital, between 2010 and 2020. Results: 171 twin pregnancies were admitted, over 10 years, with a diagnosis of premature rupture of membranes PPROM (fluid pooling on speculum and/or Insulin Growth Factor Binding Protein1 positive on vaginal secretions and oligohydramnios at ultrasound). The maternal and fetal outcomes of these pregnancies were compared to those of uneventful 178 twin pregnancies. There was no difference on risk factors. The mean gestational age at PROM was 33.9 weeks. PPROM newborns showed a lower birth weight (2072 ± 515 g vs. 2384 ± 454, p < 0.001), a higher rate of admission to neonatal intensive care unit (45.6% vs 22.2%, p < 0.001), and a higher rate of adverse outcomes, even if it did not achieve statistical significance (crude OR: 3.05, 95% CI: 2.04-4.56; adjusted OR: 1.45, 95% CI: 0.87-2.41). No cases of sepsis were found. Conclusion: In our cohort of twin pregnancies no significative risk factors for premature rupture of membranes were found. Although PROM is known to increase infectious morbidity, not all patients will develop these complications. PROM in twin pregnancies does not appear to be an independent risk factor for adverse maternal or neonatal outcomes when the effect of prematurity is accounted fo. Strategies to prolong pregnancy, when feasible, may mitigate adverse neonatal outcomes associated with PPROM in twin pregnancies
Histopathologic features and risk factors for benignity, hyperplasia, and cancer in endometrial polyps
No full textOBJECTIVE: The purpose of this study was to determine the rate of benign, hyperplastic, and malignant endometrial polyps and whether clinical data can predict histopathologic outcome.
STUDY DESIGN: Five hundred nine patients with endometrial polyps who consecutively underwent hysteroscopic removal of endometrial polyps over 48 months were identified from our gynecologiconcology surgical database. Medical reports provided clinical data. Statistical analysis was performed.
RESULTS: Histologically, 358 polyps (70.3%) were benign; 131 polyps (25.7%) had simple or complex endometrial hyperplasia, 16 polyps (3.1%) had hyperplasia with atypia, and 4 polyps (0.8%) were cancerous. Polyps were divided into group A and group B, according to the risk of malignancy (group A, benign; group B, atypical hyperplastic and cancerous). Age, menopause status, and hypertension were associated significantly with group B.
CONCLUSION: Endometrial polyps rarely become malignant, but hyperplastic changes are more common. Age, menopause status, and hypertension may increase the risk of premalignant and malignant polyps. To achieve complete removal of the polyp and a reliable histologic analysis, operative hysteroscopy should be offered to. symptomatic patients or to patients with risk factors
Prognostic value of pelvic lymphadenectomy in surgical treatment of apparent stage I endometrial cancer.
No full textBACKGROUND: The role of pelvic lymphadenectomy in early endometrial carcinoma is still being debated. MATERIALS AND METHODS: We retrospectively analyzed a total of 131 patients with FIGO stage I endometrial cancer undergoing surgery without (Group 1) or with (Group 2) pelvic lymphadenectomy. Kaplan-Meier and Cox analyses were used to calculate crude and adjusted survival rates. Moreover, the overlap of pre- and post-surgical staging was analyzed. RESULTS: Overall survival rate at 5 years was 90.1%. The difference in crude survival rates of the two groups is not statistically significant (p-value= 0.3777, log rank test). Five patients of Group 2 presented positive pelvic nodes. Therefore our results showed a pre-surgical understaging, referring to nodal involvement, in 9.1% of cases (5/55). CONCLUSION: Pelvic lymphadenectomy is a useful procedure for prognostic and staging purposes, but does not improve survival in FIGO stage I endometrial carcinoma
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