1,721,119 research outputs found
The sperm DNA fragmentation study group (SFRAG) guideline and its relevance for practicing gynecologists
No full textThis editorial highlights the key recommendations of the novel evidence-based Sperm DNA Fragmentation Guideline (SFRAG guideline) for gynecologists providing infertility care. Sperm DNA fragmentation is a biomarker of sperm’s chromatin quality. Elevated sperm DNA fragmentation rates contribute to couple’s infertility and negatively impact medically assisted reproduction outcomes. There are five main clinical scenarios in which gynecologists should consider sperm DNA fragmentation testing to guide their decision-making process. They include unexplained infertility, recurrent pregnancy loss, before (or after failed) medically assisted reproduction, and the presence of male infertility risk factors. The SFRAG guideline emphasizes the importance of corrective measures to decrease sperm DNA fragmentation rates and selection of the best medically assisted reproduction modality for the affected couples. The intended goal is to provide the foundation for standardizing care in this area while maintaining clinicians’ autonomy
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
A practical approach for the management of obstetric and infertile women during the phase two of the novel coronavirus disease 2019 (COVID ‐19) pandemic
No full textSince December 2019, the outbreak of the novel coronavirus
disease 2019 (COVID-19) has rapidly spread from China
worldwide until to be declared a pandemic. To date, worldwide,
almost 5 million confirmed cases of COVID-19 have been
reported.
It is urgent to address the impact of this pandemic on the
obstetric and reproductive medicine, seeking for reorganization
strategies of daily practice [1,2].
Although professional bodies and experts have provided
specific guidance [2], based on current limited evidences, data
on obstetric, neonatal and reproductive outcomes are still
partial [3]. In many countries after national lockdown, a Phase
2 started relaxing restrictions. To manage this phase, we
recommend adopting rigorous preventive measures. Global
lockdown has significantly impacted on new births, especially
on those obtained with assisted reproductive technology
(ART)
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
Response: Commentary: Efficacy of Follicle-Stimulating Hormone (FSH) Alone, FSH + luteinizing hormone, human menopausal gonadotropin or FSH + human chorionic gonadotropin on assisted reproductive technology outcomes in the "Personalized" Medicine Era: A meta-analysis
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
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