title: Literature search on risk factors for sarcoma: PubMed and Google Scholar may be complementary sources.
abstract: BACKGROUND
  Within the context of a European network dedicated to the study of sarcoma the relevant literature on sarcoma risk factors was collected by searching PubMed and Google Scholar, the two information storage and retrieval databases which can be accessed without charge. The present study aims to appraise the relative proficiency of PubMed and Google Scholar.
  
  
  RESULTS
  Unlike PubMed, Google Scholar does not allow a choice between "Human" and "Animal" studies, nor between "Classical" and other types of studies. As a result, searches with Google Scholar produced high numbers of citations that have to be filtered. Google Scholar resulted in a higher sensitivity (proportion of relevant articles, meeting the search criteria), while PubMed in a higher specificity (proportion of lower quality articles not meeting the criteria, that are not retrieved). Concordance between Google Scholar and PubMed was as low as 8%.
  
  
  CONCLUSIONS
  This study focused just on one topic. Although further studies are warranted, PM and GS appear to be complementary and their integration could greatly improve the search of references in medical research.
authors.affiliation: Department of Environmental Medicine and Public Health, Padua University, 35128 Padua, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Mastrangelo
authors.forename: Emanuela
authors.initials: E
authors.lastname: Fadda
authors.forename: Carlo R
authors.initials: CR
authors.lastname: Rossi
authors.forename: Emanuele
authors.initials: E
authors.lastname: Zamprogno
authors.forename: Alessandra
authors.initials: A
authors.lastname: Buja
authors.forename: Luca
authors.initials: L
authors.lastname: Cegolon
references.citation: BMJ. 2005 May 21;330(7501):1179
references.pmid: 15894554
references.citation: Ann Pharmacother. 2009 Mar;43(3):478-84
references.pmid: 19261965
references.citation: Stat Methods Med Res. 1992;1(2):123-57
references.pmid: 1341655
references.citation: J Med Libr Assoc. 2007 Oct;95(4):442-5
references.pmid: 17971893
references.citation: FASEB J. 2008 Feb;22(2):338-42
references.pmid: 17884971