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Find Duplicates among the PubMed, EMBASE, and Cochrane Library Databases in Systematic Review

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  • Xingshun Qi
  • Man Yang
  • Weirong Ren
  • Jia Jia
  • Juan Wang
  • Guohong Han
  • Daiming Fan

Abstract

Background: Finding duplicates is an important phase of systematic review. However, no consensus regarding the methods to find duplicates has been provided. This study aims to describe a pragmatic strategy of combining auto- and hand-searching duplicates in systematic review and to evaluate the prevalence and characteristics of duplicates. Methods and Findings: Literatures regarding portal vein thrombosis (PVT) and Budd-Chiari syndrome (BCS) were searched by the PubMed, EMBASE, and Cochrane library databases. Duplicates included one index paper and one or more redundant papers. They were divided into type-I (duplicates among different databases) and type-II (duplicate publications in different journals/issues) duplicates. For type-I duplicates, reference items were further compared between index and redundant papers. Of 10936 papers regarding PVT, 2399 and 1307 were identified as auto- and hand-searched duplicates, respectively. The prevalence of auto- and hand-searched redundant papers was 11.0% (1201/10936) and 6.1% (665/10936), respectively. They included 3431 type-I and 275 type-II duplicates. Of 11403 papers regarding BCS, 3275 and 2064 were identified as auto- and hand-searched duplicates, respectively. The prevalence of auto- and hand-searched redundant papers was 14.4% (1640/11403) and 9.1% (1039/11403), respectively. They included 5053 type-I and 286 type-II duplicates. Most of type-I duplicates were identified by auto-searching method (69.5%, 2385/3431 in PVT literatures; 64.6%, 3263/5053 in BCS literatures). Nearly all type-II duplicates were identified by hand-searching method (94.9%, 261/275 in PVT literatures; 95.8%, 274/286 in BCS literatures). Compared with those identified by auto-searching method, type-I duplicates identified by hand-searching method had a significantly higher prevalence of wrong items (47/2385 versus 498/1046, p

Suggested Citation

  • Xingshun Qi & Man Yang & Weirong Ren & Jia Jia & Juan Wang & Guohong Han & Daiming Fan, 2013. "Find Duplicates among the PubMed, EMBASE, and Cochrane Library Databases in Systematic Review," PLOS ONE, Public Library of Science, vol. 8(8), pages 1-12, August.
    • Handle: RePEc:plo:pone00:0071838
    DOI: 10.1371/journal.pone.0071838
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    References listed on IDEAS

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    1. David Moher & Jennifer Tetzlaff & Andrea C Tricco & Margaret Sampson & Douglas G Altman, 2007. "Epidemiology and Reporting Characteristics of Systematic Reviews," PLOS Medicine, Public Library of Science, vol. 4(3), pages 1-9, March.
    2. David Moher & Alessandro Liberati & Jennifer Tetzlaff & Douglas G Altman & The PRISMA Group, 2009. "Preferred Reporting Items for Systematic Reviews and Meta-Analyses: The PRISMA Statement," PLOS Medicine, Public Library of Science, vol. 6(7), pages 1-6, July.
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