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2. COVID-19 vaccine coverage in health-care workers in England and effectiveness of BNT162b2 mRNA vaccine against infection (SIREN): a prospective, multicentre, cohort study. Issue 10286 (8th May 2021)

7. SARS-CoV-2 infection rates of antibody-positive compared with antibody-negative health-care workers in England: a large, multicentre, prospective cohort study (SIREN). Issue 10283 (17th April 2021)

8. SARS-CoV-2 infection rates of antibody-positive compared with antibody-negative health-care workers in England: a large, multicentre, prospective cohort study (SIREN). Issue 10283 (17th April 2021)

9. Sexualized drug use ('chemsex') and high‐risk sexual behaviours in HIV‐positive men who have sex with men. Issue 4 (24th January 2018)