John Ioannidis

Ioannidis in 2015 John P. A. Ioannidis ( ; , ; born August 21, 1965) is a Greek-American physician-scientist, writer and Stanford University professor who has made contributions to evidence-based medicine, epidemiology, and clinical research. Ioannidis studies scientific research itself – in other words, meta-research – primarily in clinical medicine and the social sciences.

He has served on the editorial board of over twenty scientific journals including ''Journal of the American Medical Association'' (''JAMA''), ''Journal of the National Cancer Institute'' (''JNCI'') and ''The Lancet''.

Ioannidis's 2005 essay "Why Most Published Research Findings Are False" was the most-accessed article in the history of Public Library of Science (PLOS) as of 2020, with more than three million views. Ioannidis was a prominent opponent of lockdowns during the COVID-19 pandemic, and he has been accused of promoting conspiracy theories about COVID-19 policies and public health and safety measures. Provided by Wikipedia
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  1. 1
    Features and signals in precocious citation impact: A meta-research study.

    Features and signals in precocious citation impact: A meta-research study. by John P A Ioannidis

    Published 2025-01-01
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  2. 2
    Features and signals in precocious citation impact: A meta-research study

    Features and signals in precocious citation impact: A meta-research study by John P. A. Ioannidis

    Published 2025-01-01
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  3. 3
    Appraisal of umbrella reviews on vaccines

    Appraisal of umbrella reviews on vaccines by Rosa Katia Bellomo, John P. A. Ioannidis

    Published 2024-11-01
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  4. 4
    Patient outcomes with teaching versus nonteaching healthcare: a systematic review.

    Patient outcomes with teaching versus nonteaching healthcare: a systematic review. by Panagiotis N Papanikolaou, Georgia D Christidi, John P A Ioannidis

    Published 2006-09-01
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  5. 5
    A standardized citation metrics author database annotated for scientific field.

    A standardized citation metrics author database annotated for scientific field. by John P A Ioannidis, Jeroen Baas, Richard Klavans, Kevin W Boyack

    Published 2019-08-01
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  6. 6
    COVID-19 advocacy bias in the BMJ: meta-research evaluation

    COVID-19 advocacy bias in the BMJ: meta-research evaluation by John P A Ioannidis, Ioana Cristea, Kasper P Kepp, Taulant Muka

    Published 2025-03-01
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  7. 7
    Linking citation and retraction data reveals the demographics of scientific retractions among highly cited authors.

    Linking citation and retraction data reveals the demographics of scientific retractions among highly cited authors. by John P A Ioannidis, Angelo Maria Pezzullo, Antonio Cristiano, Stefania Boccia, Jeroen Baas

    Published 2025-01-01
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  8. 8
    Reporting of systematic reviews: the challenge of genetic association studies.

    Reporting of systematic reviews: the challenge of genetic association studies. by Muin J Khoury, Julian Little, Julian Higgins, John P A Ioannidis, Marta Gwinn

    Published 2007-06-01
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  9. 9
    Effectiveness and harms of seasonal and pandemic influenza vaccines in children, adults and elderly<subtitle>A critical review and re-analysis of 15 meta-analyses</subtitle>

    Effectiveness and harms of seasonal and pandemic influenza vaccines in children, adults and elderly<subtitle>A critical review and re-analysis of 15 meta-analyses</subtitle> by Lamberto Manzoli, John P.A. Ioannidis, Maria Elena Flacco, Corrado De Vito, Paolo Villari

    Published 2012-07-01
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  10. 10
    Meta-analysis of the immunogenicity and tolerability of pandemic influenza A 2009 (H1N1) vaccines.

    Meta-analysis of the immunogenicity and tolerability of pandemic influenza A 2009 (H1N1) vaccines. by Lamberto Manzoli, Corrado De Vito, Georgia Salanti, Maddalena D'Addario, Paolo Villari, John P A Ioannidis

    Published 2011-01-01
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  11. 11
    Reply to: On meta-analytic models and the effect of hydroxychloroquine use in COVID-19

    Reply to: On meta-analytic models and the effect of hydroxychloroquine use in COVID-19 by Andreas M. Schmitt, Cathrine Axfors, David Moher, Steven N. Goodman, John P. A. Ioannidis, Lars G. Hemkens

    Published 2025-07-01
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  12. 12
    When most fMRI connectivity cannot be detected: Insights from time course reliability.

    When most fMRI connectivity cannot be detected: Insights from time course reliability. by Jan Willem Koten, Hans Manner, Cyril Pernet, Andre Schüppen, Dénes Szücs, Guilherme Wood, John P A Ioannidis

    Published 2024-01-01
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  13. 13
    Evaluation of excess significance bias in animal studies of neurological diseases.

    Evaluation of excess significance bias in animal studies of neurological diseases. by Konstantinos K Tsilidis, Orestis A Panagiotou, Emily S Sena, Eleni Aretouli, Evangelos Evangelou, David W Howells, Rustam Al-Shahi Salman, Malcolm R Macleod, John P A Ioannidis

    Published 2013-07-01
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  14. 14
    Systematic review of the empirical evidence of study publication bias and outcome reporting bias.

    Systematic review of the empirical evidence of study publication bias and outcome reporting bias. by Kerry Dwan, Douglas G Altman, Juan A Arnaiz, Jill Bloom, An-Wen Chan, Eugenia Cronin, Evelyne Decullier, Philippa J Easterbrook, Erik Von Elm, Carrol Gamble, Davina Ghersi, John P A Ioannidis, John Simes, Paula R Williamson

    Published 2008-08-01
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  15. 15
    STrengthening the REporting of Genetic Association Studies (STREGA): an extension of the STROBE statement.

    STrengthening the REporting of Genetic Association Studies (STREGA): an extension of the STROBE statement. by Julian Little, Julian P T Higgins, John P A Ioannidis, David Moher, France Gagnon, Erik von Elm, Muin J Khoury, Barbara Cohen, George Davey-Smith, Jeremy Grimshaw, Paul Scheet, Marta Gwinn, Robin E Williamson, Guang Yong Zou, Kim Hutchings, Candice Y Johnson, Valerie Tait, Miriam Wiens, Jean Golding, Cornelia van Duijn, John McLaughlin, Andrew Paterson, George Wells, Isabel Fortier, Matthew Freedman, Maja Zecevic, Richard King, Claire Infante-Rivard, Alex Stewart, Nick Birkett, STrengthening the REporting of Genetic Association Studies

    Published 2009-02-01
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  16. 16
    SPIRIT 2025 statement: Updated guideline for protocols of randomised trials

    SPIRIT 2025 statement: Updated guideline for protocols of randomised trials by An-Wen Chan, Isabelle Boutron, Sally Hopewell, David Moher, Kenneth F. Schulz, Gary S. Collins, Ruth Tunn, Rakesh Aggarwal, Michael Berkwits, Jesse A. Berlin, Nita Bhandari, Nancy J. Butcher, Marion K. Campbell, Runcie C. W. Chidebe, Diana R. Elbourne, Andrew J. Farmer, Dean A. Fergusson, Robert M. Golub, Steven N. Goodman, Tammy C. Hoffmann, John P. A. Ioannidis, Brennan C. Kahan, Rachel L. Knowles, Sarah E. Lamb, Steff Lewis, Elizabeth Loder, Martin Offringa, Philippe Ravaud, Dawn P. Richards, Frank W. Rockhold, David L. Schriger, Nandi L. Siegfried, Sophie Staniszewska, Rod S. Taylor, Lehana Thabane, David J. Torgerson, Sunita Vohra, Ian R. White, Asbjørn Hróbjartsson

    Published 2025-04-01
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  17. 17
    CONSORT 2025 statement: Updated guideline for reporting randomised trials.

    CONSORT 2025 statement: Updated guideline for reporting randomised trials. by Sally Hopewell, An-Wen Chan, Gary S Collins, Asbjørn Hróbjartsson, David Moher, Kenneth F Schulz, Ruth Tunn, Rakesh Aggarwal, Michael Berkwits, Jesse A Berlin, Nita Bhandari, Nancy J Butcher, Marion K Campbell, Runcie C W Chidebe, Diana Elbourne, Andrew Farmer, Dean A Fergusson, Robert M Golub, Steven N Goodman, Tammy C Hoffmann, John P A Ioannidis, Brennan C Kahan, Rachel L Knowles, Sarah E Lamb, Steff Lewis, Elizabeth Loder, Martin Offringa, Philippe Ravaud, Dawn P Richards, Frank W Rockhold, David L Schriger, Nandi L Siegried, Sophie Staniszewska, Rod S Taylor, Lehana Thabane, David Torgerson, Sunita Vohra, Ian R White, Isabelle Boutron

    Published 2025-04-01
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  18. 18
    CONSORT 2025 statement: updated guideline for reporting randomized trials: a Korean translation

    CONSORT 2025 statement: updated guideline for reporting randomized trials: a Korean translation by Sally Hopewell, An-Wen Chan, Gary S. Collins, Asbjørn Hróbjartsson, David Moher, Kenneth F. Schulz, Ruth Tunn, Rakesh Aggarwal, Michael Berkwits, Jesse A. Berlin, Nita Bhandari, Nancy J. Butcher, Marion K. Campbell, Runcie C. W. Chidebe, Diana Elbourne, Andrew Farmer, Dean A. Fergusson, Robert M. Golub, Steven N. Goodman, Tammy C. Hoffmann, John P. A. Ioannidis, Brennan C. Kahan, Rachel L. Knowles, Sarah E. Lamb, Steff Lewis, Elizabeth Loder, Martin Offringa, Philippe Ravaud, Dawn P. Richards, Frank W. Rockhold, David L. Schriger, Nandi L. Siegried, Sophie Staniszewska, Rod S. Taylor, Lehana Thabane, David Torgerson, Sunita Vohra, Ian R. White, Isabelle Boutron

    Published 2025-07-01
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  19. 19
    SPIRIT 2025 statement: Updated guideline for protocols of randomised trials.

    SPIRIT 2025 statement: Updated guideline for protocols of randomised trials. by An-Wen Chan, Isabelle Boutron, Sally Hopewell, David Moher, Kenneth F Schulz, Gary S Collins, Ruth Tunn, Rakesh Aggarwal, Michael Berkwits, Jesse A Berlin, Nita Bhandari, Nancy J Butcher, Marion K Campbell, Runcie C W Chidebe, Diana R Elbourne, Andrew J Farmer, Dean A Fergusson, Robert M Golub, Steven N Goodman, Tammy C Hoffmann, John P A Ioannidis, Brennan C Kahan, Rachel L Knowles, Sarah E Lamb, Steff Lewis, Elizabeth Loder, Martin Offringa, Philippe Ravaud, Dawn P Richards, Frank W Rockhold, David L Schriger, Nandi L Siegfried, Sophie Staniszewska, Rod S Taylor, Lehana Thabane, David J Torgerson, Sunita Vohra, Ian R White, Asbjørn Hróbjartsson

    Published 2025-04-01
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  20. 20
    Evaluation of association of HNF1B variants with diverse cancers: collaborative analysis of data from 19 genome-wide association studies.

    Evaluation of association of HNF1B variants with diverse cancers: collaborative analysis of data from 19 genome-wide association studies. by Katherine S Elliott, Eleftheria Zeggini, Mark I McCarthy, Julius Gudmundsson, Patrick Sulem, Simon N Stacey, Steinunn Thorlacius, Laufey Amundadottir, Henrik Grönberg, Jianfeng Xu, Valerie Gaborieau, Rosalind A Eeles, David E Neal, Jenny L Donovan, Freddie C Hamdy, Kenneth Muir, Shih-Jen Hwang, Margaret R Spitz, Brent Zanke, Luis Carvajal-Carmona, Kevin M Brown, Australian Melanoma Family Study Investigators, Nicholas K Hayward, Stuart Macgregor, Ian P M Tomlinson, Mathieu Lemire, Christopher I Amos, Joanne M Murabito, William B Isaacs, Douglas F Easton, Paul Brennan, PanScan Consortium, Rosa B Barkardottir, Daniel F Gudbjartsson, Thorunn Rafnar, David J Hunter, Stephen J Chanock, Kari Stefansson, John P A Ioannidis

    Published 2010-05-01
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