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PubMed2002

Scientific publications in endoscopic ultrasonography: a 20-year global survey of the literature.

BACKGROUND AND STUDY AIMS: Endoscopic ultrasound imaging of mediastinum, gastrointestinal tract and pancreas, and endoscopic ultrasound-guided fine-needle aspiration of suspicious lesions, have now been available for several years. Although many papers have been published on endoscopic ultrasonography, a comprehensive overview of the subject matter presented has not yet been carried out. An extensive survey of the literature on endoscopic ultrasonography since its inception in the 1980 s was conducted in this study; key points are summarized. METHODS: A computer-based PubMed search system was used to retrieve all available abstracts pertaining to endoscopic ultrasound from 1980 to the present. Data were collected concerning the impact factor, the various EUS instruments and fine-needle aspiration biopsy techniques used, and the subject matter, as well as the journals publishing the abstracts. RESULTS: A total of 1259 articles were published in 65 journals: 440 (35 %) Western European studies, 404 (32 %) American studies, and 321 (26 %) Japanese studies were retrieved. The total and average impact factor per paper was highest for American papers, followed by European papers and Japanese papers. Forty-seven percent of the papers were published in Gastrointestinal Endoscopy and Endoscopy. The most frequently discussed topics concerned the staging of various malignancies, including esophageal, gastric, pancreatic, and colorectal cancer. The average sample size per paper was in the range 25 - 50. The various types of study included retrospective inquiries (25 %), reviews (24 %), prospective studies (17 %), and case reports (15 %). CONCLUSIONS: Over the course of the past 20 years, there has been a progressive increase in the number of publications pertaining to endoscopic ultrasonography. Large-scale prospective studies are now needed to validate earlier reports. In addition, the diagnostic and therapeutic role of endoscopic ultrasound needs to be more widely publicized among physicians in all health-care fields, so that appropriate patients may be referred.

Endosonography↗
PubMed1998

[Scientific activities in departments of clinical physiology/nuclear medicine in Denmark during the period 1989-1994. A bibliometric analysis of the "impact" and citation frequency].

This study reports a bibliometric analysis of 860 scientific publications of which 763 are papers in scientific journals emanating from departments of clinical physiology and nuclear medicine in Denmark in the years 1989-1994. The number of publications decreased significantly over time. The 763 papers were published in 239 different scientific journals, 80% in journals with an official "impact factor". The average impact per paper remained almost constant over time and was significantly above the national average. A close relationship was found between the number of papers from a department and its cumulated impact. In an analysis of 217 papers a direct relation was found between the journal impact factor and the citation factor. A linear relation was found between cumulated citations and time, and the number of citations per year reached a maximum 3-7 years after publication, whereas the general maximum for all medical specialties is 2-3 years. It is concluded that the total number of scientific papers from Danish departments of clinical physiology & nuclear medicine fell in the years 1989-1991, but the impact per paper was almost constant and above the national average. There seems to be a good agreement between journal impact factor and overall citation frequency in papers from clinical physiology & nuclear medicine.

Bibliometrics↗
PubMed1999

[Trends concerning medical articles 1989-1998. A study of Danish articles compared to other members of the European Union].

The paper analyses the development of the total number of journal articles indexed in the Medline database published by authors affiliated to Denmark 1989-1998 in medicine compared to the development in the European Union during the same period. The publication analysis is then compared to the citation impact of articles published in the central journals indexed in Science Citation Index (ISI) 1987-1996 through use of the National Science Indicators (NIS, ISI) database. The total number of Danish journal articles has remained relatively constant compared to a 50% increase in the EU as a whole. The number of Danish articles published in central journals, however, has increased by 20% (compared to 27% for the EU) and the number of citations obtained by these articles by 58% (compared to 66% for the EU) in the 1987-1996 period. By population, Denmark ranked third in total number of articles in 1998. In conclusion, Denmark is very active in medical research but neither the quantity nor the quality of Danish medical research has increased at the same rate as the EU average.

Databases, Bibliographic↗
PubMed1998

The journal "impact factor": a misnamed, misleading, misused measure.

The Institute for Scientific Information (ISI), a database publishing company that publishes Current Contents and Science Citation Index, has devised and promulgated what it terms the journal "impact factor." ISI describes this factor as a "measure of the frequency with which the 'average article' in a journal has been cited in a particular year." The factor is a ratio between citations and recent citable published items calculated by dividing the number of all current citations of items published in a journal during the preceding 2 years by the number of articles published in those 2 years by that journal. What, if anything, is wrong with the "impact factor"? There is absolutely nothing incorrect with the calculation of the ratio itself. However, the "impact factor" is misnamed and misleading. Being misnamed and misleading, the "impact factor" has been misused. It is being held out as a measure of the importance of a specific journal article and the journal in which the article appeared. By extension, the "impact factor" is also being misused to gauge the relative importance of individual researchers, research programs, and even the institution hosting the research. We recommend that the term "impact factor" be abolished and that this measure be renamed in keeping with its actual role, that merely of a time-specific "citation rate index" and nothing more. What is currently called the "impact factor" should not be misused to evaluate journals or to validate the scientific relevance of a particular researcher or research program, especially in decisions regarding employment, funding, and tenure.

Bibliometrics↗
PubMed2003

Citation analysis and journal impact factors in ophthalmology and vision science journals.

Citation analysis has evolved over the last 50 years as one parameter for assessing the quality of research published in scientific, technology and social science journals. This is based on the assumption that influential research is widely cited by other scientists and clinicians. With the advent of the Internet, Journal Citation Reports from the Institute for Scientific Information (ISI-JCR) have become widely available to individuals and institutions. In an increasingly competitive research environ-ment, aspects of citation analysis have been suggested as simple proxy, objective measures to evaluate the research quality of a journal, published articles, research institutions and even individual researchers. This review article provides an overview of citation analysis, including definitions, uses of these reports, and related controversies and potential abuses. As it has become the most commonly used indicator, there is a particular focus on the use of the Journal Impact Factor (JIF). This is a widely quoted measure indicating the frequency with which the average article published in a journal of interest will be quoted within a specified time frame that therefore allows approximate comparisons of journals within a particular field of interest. Given the relative paucity of information in this area, emphasis is placed on citation analysis within ophthalmology, in particular in regard to the 43 ophthal-mology, vision science and optometry journals that are listed in the ISI-JCR 2001 reports.

Bibliometrics↗
PubMedDate not supplied

[Arquivos Brasileiros de Nutrição: a review of scientific research on nutrition in Brazil from 1944 to 1968].

This study reviews 209 original articles published in the journal Arquivos Brasileiros de Nutrição (1944/1968), a periodical edited by Josué de Castro, physician, specialist in nutrition, and founder-director of the Institute of Nutrition at the University of Brazil (now the Federal University of Rio de Janeiro). Our methodology was based on quantitative and qualitative analyses, aimed at summarizing both the topic itself and the authors' backgrounds. Results showed that 134 of the articles (64%) adopted a biological perspective to nutrition, mostly focusing on laboratory research concerning the chemical composition and nutritional value of Brazilian foodstuffs. On the other hand, 75 articles (36%) took a social perspective, testifying to the first efforts by Brazilian nutritional experts to create and improve specific methodological tools for investigating our population's nutritional conditions, thereby helping to consolidate the field of nutrition in the country.

Brazil↗
PubMedDate not supplied

[Systematization of the knowledge of tropical medicine through its technical and scientific flow].

Through the analysis of different scientific-investigative and scientific-informative parameters it is attempted the approach and suggestion of solutions to the problems of bibliographic dispersion in tropical medicine. To this purpose, the work performed in determining the degree of development of the main investigative and development trends at an international scale is exposed. The production of information by countries and continents as well as the main periodic and serial (journals) publications and languages with the highest diffusion in tropical medicine are analyzed. The value of the bibliographic dispersion coefficient in tropical medicine is pointed out, and it is compared to other branches and specialties within biomedical sciences.

Americas↗