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Effect of published papers by the Institute for Health Metrics and Evaluation on the impact factor of The Lancet journal
  1. Mohammad Saeid Rezaee-Zavareh,
  2. Hamidreza Karimi-Sari
  1. Middle East Liver Diseases (MELD) Center, Tehran, Iran
  1. Correspondence to Dr Hamidreza Karimi-Sari, Middle East Liver Diseases (MELD) Center, No. 178, Cross Shadab, Gharani Street, Ferdowsi Square, Tehran, IR Iran. Tel: +98-2188945186, Fax: +98-2188945188, Iran; dr.karimih{at}

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Kaldas and colleagues discussed the advantages and disadvantages of journal impact factor (IF) in a recent review.1 As another limitation for journal IF, a recent article by Lei and Sun showed the effect of highly-cited items on journal IF calculation.2 Here, we want to investigate the effect of a series of highly cited items, namely papers affiliated with the Institute for Health Metrics and Evaluation (IHME), on The Lancet journal’s IF.

Published papers by the IHME (University of Washington’s School of Medicine, Seattle, WA, USA) provide a comprehensive picture of health status worldwide.3 These papers can be repeatedly cited by health policymakers and researchers, which can in turn lead to these papers attracting many citations. Each year, studies on the global burden of …

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  • Contributors Concept: HK-S, MSR-Z. Data acquisition and analysis: HK-S; MSR-Z. Manuscript drafting: MSR-Z. Critical revision: HK-S. Final approval and agreement: HK-S; MSR-Z.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests HK-S has been listed among collaborators in four IHME-affiliated papers. MSR-Z has nothing to declare

  • Patient consent for publication Not required.

  • Provenance and peer review Not commissioned; internally peer reviewed.