Frequency and impact of confounding by indication and healthy vaccinee bias in observational studies assessing influenza vaccine effectiveness: a systematic review

Observer bias in randomized clinical trials with time-to-event outcomes: systematic review of trials with both blinded and non-blinded outcome assessors

(2014) Asbjørn Hróbjartsson et al.   INTERNATIONAL JOURNAL OF EPIDEMIOLOGY

After adjusting for bias in meta-analysis seasonal influenza vaccine remains effective in community-dwelling elderly

(2014) Maryam Darvishian et al.   JOURNAL OF CLINICAL EPIDEMIOLOGY

Influenza vaccination reduces hospitalization for acute coronary syndrome in elderly patients with chronic obstructive pulmonary disease: A population-based cohort study

(2014) Li-Chin Sung et al.   VACCINE

Further Evidence for Bias in Observational Studies of Influenza Vaccine Effectiveness: The 2009 Influenza A(H1N1) Pandemic

(2013) M. L. Jackson et al.   AMERICAN JOURNAL OF EPIDEMIOLOGY

Preferred Reporting Items for Systematic Reviews and Meta-Analyses: The PRISMA Statement

(2013) David Moher   ANNALS OF INTERNAL MEDICINE

The test-negative design for estimating influenza vaccine effectiveness

(2013) Michael L. Jackson et al.   VACCINE

Mortality of Dialysis Patients According to Influenza and Pneumococcal Vaccination Status

(2012) T. Christopher Bond et al.   AMERICAN JOURNAL OF KIDNEY DISEASES

Estimating Influenza Vaccine Effectiveness in Community-Dwelling Elderly Patients Using the Instrumental Variable Analysis Method

(2012) Kenny Wong   ARCHIVES OF INTERNAL MEDICINE

Influenza Vaccine Effectiveness in Patients on Hemodialysis

(2012) Abhijit V. Kshirsagar   ARCHIVES OF INTERNAL MEDICINE

Influenza Vaccination and Major Adverse Vascular Events in High-Risk Patients

(2012) Jennie Johnstone et al.   CIRCULATION

Effects of annual influenza vaccination on mortality and hospitalization in elderly patients with ischemic heart disease: A nationwide population-based study

(2012) I-Fan Liu et al.   PREVENTIVE MEDICINE

Why do covariates defined by International Classification of Diseases codes fail to remove confounding in pharmacoepidemiologic studies among seniors?

(2011) Michael L. Jackson et al.   PHARMACOEPIDEMIOLOGY AND DRUG SAFETY

Influenza Vaccine Effectiveness in the Elderly Based on Administrative Databases: Change in Immunization Habit as a Marker for Bias

(2011) Travis S. Hottes et al.   PLoS One

Maternal Influenza Immunization and Reduced Likelihood of Prematurity and Small for Gestational Age Births: A Retrospective Cohort Study

(2011) Saad B. Omer et al.   PLOS MEDICINE

Influenza vaccination is associated with reduced severity of community-acquired pneumonia

(2010) A. Tessmer et al.   EUROPEAN RESPIRATORY JOURNAL

Influenza vaccination and all-cause mortality in community-dwelling elderly in Ontario, Canada, a cohort study

(2010) Michael A. Campitelli et al.   VACCINE

Impact of influenza vaccination on mortality risk among the elderly

(2009) R. H. H. Groenwold et al.   EUROPEAN RESPIRATORY JOURNAL

New strategies are needed to improve the accuracy of influenza vaccine effectiveness estimates among seniors

(2009) Jennifer Clark Nelson et al.   JOURNAL OF CLINICAL EPIDEMIOLOGY

Influenza but not pneumococcal vaccination protects against all-cause mortality in patients with COPD

(2009) S Schembri et al.   THORAX

Challenges in evaluating influenza vaccine effectiveness and the mortality benefits controversy

(2009) Kristin L. Nichol   VACCINE

Influenza vaccination and mortality benefits: New insights, new opportunities

(2009) Lone Simonsen et al.   VACCINE

Influenza Vaccination Among College and University Students

(2008) Kristin L. Nichol et al.   ARCHIVES OF PEDIATRICS & ADOLESCENT MEDICINE

Burden of Influenza‐Like Illness and Effectiveness of Influenza Vaccination among Working Adults Aged 50–64 Years

(2008) Kristin L. Nichol et al.   CLINICAL INFECTIOUS DISEASES

Influenza vaccination and risk of community-acquired pneumonia in immunocompetent elderly people: a population-based, nested case-control study

(2008) Michael L Jackson et al.   LANCET