title: [Hierarchical structure of authors collaboration. An analysis of papers on imaging diagnosis published by hospital radiology departments in Comunidad Valenciana (1994-2001)].
abstract: OBJECTIVE
  Analyze the different contribution of hierarchical categories in the papers published by radiologists of hospitals belonging to Comunidad Valenciana along the period 1994-2001, as well as their distribution in the different journals.
  
  
  METHODS
  For the recovery of the papers sample we have designed specific search profiles for EMI and Medline databases. Hierarchical category of the authors was identified through personal interviews.
  
  
  RESULTS
  We have analyzed 417 works, with 1,321 authors distributed in the following form: chief of service, 8.8%; chief of section, 12.4%; assistant physician, 50.7%, and resident, 28%. Hierarchical groupings with participation of residents were more consistent for publishing papers along all the study period (1994-2001). Higher percentage of papers (21%) corresponded to <<residents + adjunct physicians>> grouping. Radiología was the most productive journal (42% papers). All results were statistically significant (p < 0.0001).
  
  
  CONCLUSIONS
  Radiodiagnosis residents of Comunidad Valenciana hospitals showed an active participation in research papers published along the period 1994-2001, in collaboration with the rest of the hierarchical categories, basically with the assistant physician. Assistant physicians contributed most of papers. Chief of section and chief of department contributed fifth of papers.
authors.affiliation: Servicio de Radiología, Hospital Universitario Dr. Peset, Valencia, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Miguel-Dasit
authors.forename: L
authors.initials: L
authors.lastname: Martí-Bonmatí
authors.forename: P
authors.initials: P
authors.lastname: Sanfeliu
authors.forename: R
authors.initials: R
authors.lastname: Aleixandre
authors.forename: J C
authors.initials: JC
authors.lastname: Valderrama
mesh_terms: D019992:Databases as Topic; D006801:Humans; D010823:Physician Assistants / Q000706:statistics & numerical data; D010820:Physicians / Q000706:statistics & numerical data; D011643:Publishing / Q000706:statistics & numerical data*; D011871:Radiology / Q000706:statistics & numerical data*; D013030:Spain / Q000453:epidemiology