Reference health
Clinical Characteristics and Risk Factors for COVID-19 Infection and Disease Severity: A Nationwide Observational Study in Estonia
36/36 checkable references clean · checked 2026-08-29
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a retraction, withdrawal, or removal notice.
29 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 36 checked references that resolve
resolves10.1038/d41586-020-01003-6
Special report: The simulations driving the world’s response to COVID-19
resolves10.1016/S1473-3099(20)30371-6
Risk factors for SARS-CoV-2 among patients in the Oxford Royal College of General Practitioners Research and Surveillance Centre primary care network: a cross-sectional study
resolves10.1136/bmjopen-2020-044640
Demographic risk factors for COVID-19 infection, severity, ICU admission and death: a meta-analysis of 59 studies
resolves10.1371/journal.pmed.1003321
Comorbidities associated with mortality in 31,461 adults with COVID-19 in the United States: A federated electronic medical record analysis
resolves10.1038/s41591-020-01191-8
Individual and community-level risk for COVID-19 mortality in the United States
resolves10.1136/oem.2004.014472
An incidence density sampling program for nested case-control analyses
resolves10.1016/0021-9681(87)90171-8
A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation
resolves10.1001/jamanetworkopen.2020.12270
Clinical Characteristics and Morbidity Associated With Coronavirus Disease 2019 in a Series of Patients in Metropolitan Detroit
resolves10.1001/jamainternmed.2020.3539
Risk Factors Associated With Mortality Among Patients With COVID-19 in Intensive Care Units in Lombardy, Italy
resolves10.1016/j.vaccine.2019.10.005
Influenza vaccination and respiratory virus interference among Department of Defense personnel during the 2017–2018 influenza season
resolves10.1093/aje/kwq433
Updating and Validating the Charlson Comorbidity Index and Score for Risk Adjustment in Hospital Discharge Abstracts Using Data From 6 Countries
resolves10.15585/mmwr.mm7009a4
Estimated SARS-CoV-2 Seroprevalence Among Persons Aged <18 Years — Mississippi, May–September 2020
resolves10.1038/s41467-021-21100-y
The natural history of symptomatic COVID-19 during the first wave in Catalonia
resolves10.1002/wps.20806
Increased risk of
<scp>COVID</scp>
‐19 infection and mortality in people with mental disorders: analysis from electronic health records in the United States
resolves10.1002/alz.12296
COVID‐19 and dementia: Analyses of risk, disparity, and outcomes from electronic health records in the US
resolves10.1371/journal.pone.0241827
COVID-19 gender susceptibility and outcomes: A systematic review
resolves10.1053/j.ajkd.2007.11.022
Expression of ACE and ACE2 in Individuals With Diabetic Kidney Disease and Healthy Controls
resolves10.1038/ki.2008.497
Decreased glomerular and tubular expression of ACE2 in patients with type 2 diabetes and kidney disease
resolves10.1016/j.immuni.2020.04.003
COVID-19: A New Virus, but a Familiar Receptor and Cytokine Release Syndrome
resolves10.1371/journal.pone.0255541
Examining the potential benefits of the influenza vaccine against SARS-CoV-2: A retrospective cohort analysis of 74,754 patients
resolves10.1038/s41598-021-83641-y
Exploratory analysis of immunization records highlights decreased SARS-CoV-2 rates in individuals with recent non-COVID-19 vaccinations
resolves10.1016/j.ebiom.2021.103403
Comparing infectivity and virulence of emerging SARS-CoV-2 variants in Syrian hamsters
resolves10.1093/infdis/jit610
Sex Bias in the Outcome of Human Tropical Infectious Diseases: Influence of Steroid Hormones
resolves10.1093/infdis/jiu147
Biological Differences Between the Sexes and Susceptibility to Tuberculosis
resolves10.1097/MNH.0b013e328341164a
Angiotensin-converting enzyme 2 is a key modulator of the renin–angiotensin system in cardiovascular and renal disease
resolves10.1038/s41591-021-01410-w
Impact of vaccination on new SARS-CoV-2 infections in the United Kingdom
The 29 references without a DOI — listed, not checked
no DOI — not checkedref1
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no DOI — not checkedFeatures of 20133 UK patients in hospital with covid-19 using the ISARIC WHO Clinical Characterisation Protocol: prospective observational cohort study
no DOI — not checkedref6
no DOI — not checkedref9
no DOI — not checkedEstonia: Health system review
no DOI — not checkedref18
no DOI — not checkedref19
no DOI — not checkedref20
no DOI — not checkedref21
no DOI — not checkedref23
no DOI — not checkedref24
no DOI — not checkedFactors associated with hospital admission and critical illness among 5279 people with coronavirus disease
no DOI — not checkedref29
no DOI — not checkedref30
no DOI — not checkedref33
no DOI — not checkedref34
no DOI — not checkedref35
no DOI — not checkedref37
no DOI — not checkedHousehold Transmission of SARS-CoV-2 in the United States
no DOI — not checkedref39
no DOI — not checkedChronic diseases, health conditions and risk of COVID-19-related hospitalization and in-hospital mortality during the first wave of the epidemic in France: a cohort study of 66 million people
no DOI — not checkedref49
no DOI — not checkedref53
no DOI — not checkedref59
no DOI — not checkedExcess pneumonia-influenza mortality by age and sex in three major influenza A2 epidemics
no DOI — not checkedPrevalence of SARS-CoV-2 IgG antibodies and their association with clinical symptoms of COVID-19 in Estonia (KoroSero-EST-1 study)
no DOI — not checkedref64
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