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,
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Comparison of the characteristics, morbidity, and mortality of COVID-19 and seasonal influenza: a nationwide, population-based retrospective cohort study
Risk factors and disease profile of post-vaccination SARS-CoV-2 infection in UK users of the COVID Symptom Study app: a prospective, community-based, nested, case-control study
Health Care Utilization and Clinical Characteristics of Nonhospitalized Adults in an Integrated Health Care System 28–180 Days After COVID-19 Diagnosis — Georgia, May 2020–March 2021
Impacts of COVID-19 on long-term health and health care use
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no DOI — not checkedNational Institute for Health and Care Excellence. COVID-19 rapid guideline: managing the long-term effects of COVID-19. 2021. https://www.nice.org.uk/guidance/ng188/resources/covid19-rapid-guideline-managing-the-longterm-effects-of-covid19-pdf-51035515742
no DOI — not checkedWorld Health Organization. A clinical case definition of post COVID-19 condition by a Delphi consensus, 6 October 2021. 2021. https://www.who.int/publications/i/item/WHO-2019-nCoV-Post_COVID-19_condition-Clinical_case_definition-2021.1.
no DOI — not checkedUK government. Coronavirus (Covid-19) dashboard https://coronavirus.data.gov.uk/details/healthcare.
no DOI — not checkedMedicines and Healthcare products Regulatory Agency. Release note CPRD Aurum. 2021. https://www.cprd.com/sites/default/files/2021-06%20CPRD%20Aurum%20Release%20Notes.pdf.
no DOI — not checkedRogers W . Regression standard errors in clustered samples. Stata Tech Bull 1994;3.
no DOI — not checkedAyoubkhani D, Pawelek P, Bosworth M. Prevalence of ongoing symptoms following coronavirus (COVID-19) infection in the UK: 5 August 2021. 2021. https://www.ons.gov.uk/peoplepopulationandcommunity/healthandsocialcare/conditionsanddiseases/bulletins/prevalenceofongoingsymptomsfollowingcoronaviruscovid19infectionintheuk/5august2021
no DOI — not checkedUK government. Coronavirus. (Covid-19) dashboard https://coronavirus.data.gov.uk/details/cases.
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