title: Spanish scientific output on Helicobacter pylori. A study through Medline.
abstract: OBJECTIVE
  to analyze scientific output from Spanish hospitals in relation to Helicobacter pylori infection.
  
  
  METHODS
  papers collected from the Medline database between January 1988 and December 2003 were selected. Our search strategy was: "Helicobacter pylori" [MeSH] AND ((Spain [AD] OR Espana [AD] OR Spanien [AD] OR Espagne [AD] OR Espanha [AD]) OR (Spanish [LA]) OR Spain). The following was analyzed: geographic area, Spanish or foreign publication, topic, and year of publication. Output and impact bibliometric markers were evaluated.
  
  
  RESULTS
  in all, 691 papers were identified, of which 241 were excluded. Number of papers went from 2 in 1988 to 47 in 2002 and 13 in 2003. There were more reports in Spanish versus foreign journals (58 vs. 42%). In the first 5 years the areas with greater output were associated with diagnosis and microbiology (33 and 20%), whereas therapy was the predominating subject during the last 5 years (27%). Original papers were most common among publications (69%). Hospitals with highest output included La Princesa (24%) and Ramón y Cajal (17.6%) in Madrid, and Parc Taulí in Barcelona (6.4%). Mean impact factor progressively increased from 1.826 in 1988 to 2.142 in 2002 and 2.493 in 2003.
  
  
  CONCLUSIONS
  the production and impact of documents published by Spanish scientists regarding H. pylori infection considerably increased during the past two decades.
authors.affiliation: Service of Digestive Diseases, Hospital Universitario de La Princesa, Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Trapero-Marugán
authors.forename: J P
authors.initials: JP
authors.lastname: Gisbert
authors.forename: J M
authors.initials: JM
authors.lastname: Pajares
mesh_terms: D015706:Bibliometrics; D016480:Helicobacter pylori; D016239:MEDLINE; D010506:Periodicals as Topic / Q000706:statistics & numerical data*; D011643:Publishing / Q000706:statistics & numerical data*; D013030:Spain