309,537 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Cost-effectiveness analysis on the use of rFSH + rLH for the treatment of anovulation in hypogonadotropic hypogonadal women
No full textEnrico Papaleo,1 Carlo Alviggi,2 Giorgio Lorenzo Colombo,3,4 Claudio Pisanelli,5,6 Claudio Ripellino,7 Salvatore Longobardi,8 Pier Luigi Canonico91Centro Scienze della Natalità, Gynecological-Obstetrics Department, San Raffaele Hospital, Vita-Salute San Raffaele, Milan, Italy; 2Department of Neuroscience, Reproductive Sciences and Odontostomatology, University “Federico II” of Naples, Naples, Italy; 3Department of Drug Sciences, University of Pavia, Pavia, Italy; 4SAVE Studi Analisi Valutazioni Economiche, Milan, Italy; 5ACO San Filippo Neri, Rome, Italy; 6Società Italiana Di Farmacia Ospedaliera, Milan, Italy; 7CSD Medical Research Srl, Milan, Italy; 8Medical Department, Merck Serono SpA, Rome, Italy; 9Department of Pharmaceutical Sciences, University of Piemonte Orientale, Novara, Italy Background: Hypogonadotropic hypogonadal women are characterized by ovarian functionality deficiency, caused by low concentrations of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). To recover reproduction functionality, recommended therapies for ovarian induction involve injections of FSH and LH medications. Objective: Since important differences exist between recombinant and urinary gonadotropin therapies in terms of efficacy and cost, the objective of this study was to develop a cost-effectiveness model to compare recombinant FSH (rFSH) + recombinant LH (rLH) and highly purified human menopausal gonadotropin (HP-HMG). Methods: A Markov model was developed, considering three cycles of therapy; probability of pregnancy and miscarriage were considered, and the efficacy was evaluated in terms of pregnancy occurrence. The perspective of the model was that of the Italian Health Service, so only direct cost (drugs, specialist visits, patient examinations, and hospitalizations) were included. Results: rFSH + rLH is associated with a higher total cost (€3,453.50) and higher efficacy (0.87) compared with HP-HMG (€2,719.70 and 0.50). rFSH + rLH generated an incremental cost effectiveness ratio equal to €2,007.30 compared to HP-HMG; the average cost per pregnancy is estimated to be €3,990.00 for recombinant strategy and €5,439.80 for urinary strategy. Results of probabilistic sensitivity analysis were consistent with the abovementioned findings. Conclusion: Despite the higher acquisition cost in comparison to HP-HMG, rFSH + rLH resulted in a higher pregnancy rate, which makes it the recommended choice when considering cost-effectiveness of LH in supporting FSH-induced follicular gonadotropins in hypogonadotropic hypogonadal women. Keywords: HP-HMG, hypogonadotropic hypogonadism, gonadotropi
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Identificazioni di nuove variabili predittive di qualità ovocitaria ed embrionaria nei programmi di procreazione medicalmente assistita
No full textAttualmente, nel protocollo standard di fecondazione in vitro, gli embrioni più idonei al trasferimento in utero vengono scelti in base ad una valutazione morfologica, due o tre giorni dopo la fecondazione. D’altro canto alcuni lavori suggeriscono che anche l’analisi morfologica degli zigoti può essere indicativa di successo nella fertilizzazione in vitro. Su tali evidenze, note da diversi anni in letteratura, si basano i primi passi del lavoro di ricerca svolto nel corso di dottorato, avendo come obiettivo quello di elaborare un sistema di scoring combinato (weighted score) che tenesse conto dello score degli embrioni pre-impianto, dello score degli zigoti e del numero di blastomeri degli embrioni pre-transfer. Il sistema, una volta elaborato, è stato testato mediante un analisi retrospettiva, al fine di valutare il suo valore predittivo in termini di percentuale di gravidanza e di tasso d’impianto. I dati ottenuti suggeriscono che il presente sistema di score combinato può essere utilizzato per stabilire una strategia nei cicli di fecondazione assistita per ridurre il numero di embrioni selezionati per il transfer, tutto ciò al fine di mantenere alte le percentuali di gravidanza riducendo l’incidenza di gravidanze multiple. In una seconda fase del dottorato di ricerca si è cercato di andare a determinare l’esistenza di una eventuale correlazione tra livelli intra-follicolari di leptina, i tassi di fertilizzazione ovocitaria ed il precedentemente testato sistema scoring embrionario. I risultati ottenuti evidenziano una correlazione positiva tra i livelli intrafollicolari di leptina e qualità ovocitaria intesa come “attitudine” alla fertilizzazione. Risulta inoltre evidente come la concentrazione intrafollicolare di leptina non sia correlata in maniera significativa con lo sviluppo e la qualità degli embrioni nelle tecniche di fecondazione assistita. Se i risultati riportati dovessero trovare conferma, la valutazione della concentrazione intrafollicolare di leptina potrebbe rappresentare un utile strategia nella selezione degli ovociti da destinare alle tecniche di fecondazione assistita
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
No full textThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
Recombinant LH administration in down-regulated women with initial poor response to recombinant FSH
No full text
Study of hadronic event shape in flavour tagged events in e+e- annihilation at <s>=197GeV
No full text[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
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