Research contribution of different world regions in the top 50 biomedical journals (1995-2002).

We evaluated all articles published by different world regions in the top 50 biomedical journals in the database of the Journal Citation Reports-Institute for Scientific Information for the period between 1995 and 2002. The world was divided into 9 regions [United States of America (the U.S.

Estimates of global production in cardiovascular diseases research.

Objective: To evaluate the contribution of different world regions in cardiovascular research production.

Methods: The world was divided into 9 regions based on a combination of geographic, economic and scientific criteria. Using the Medline database, we retrieved articles from 77 journals included in the "Cardiac and Cardiovascular Systems" category of the "Journal Citation Reports" database for the period 1995-2002.

Worldwide trends in quantity and quality of published articles in the field of infectious diseases.

Background: Trying to confront with the widespread burden of infectious diseases, the society worldwide invests considerably on research. We evaluated the contribution of different world regions in research production in Infectious Diseases.

Methods: Using the online Pubmed database we retrieved articles from 38 journals included in the "Infectious Diseases" category of the "Journal Citation Reports" database of the Institute for Scientific Information for the period 1995-2002.