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EBM analysis
Factors influencing estimated effectiveness of COVID-19 vaccines in non-randomised studies

Authors

  • John P A Ioannidis Stanford Prevention Research Center, Department of Medicine and Department of Epidemiology and Population Health, and Meta-Research Innovation Center at Stanford (METRICS), Stanford University, Stanford, California, USA PubMed articlesGoogle scholar articles
  1. Correspondence to Dr John P A Ioannidis, SPRC, Medical School Office Building, Room X306, 1265 Welch Road, Stanford University, Stanford, California, USA; jioannid{at}stanford.edu
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Citation

Ioannidis JPA
Factors influencing estimated effectiveness of COVID-19 vaccines in non-randomised studies
BMJ Evidence-Based Medicine 2022;27:324-329.

Publication history

  • Accepted March 5, 2022
  • First published March 25, 2022.
Online issue publication 
May 05, 2023

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. http://creativecommons.org/licenses/by-nc/4.0/This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.