1. Public Health England. Excess weight and covid-19. Jul 2020. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/903770/PHE_insight_Excess_weight_and_COVID-19.pdf.
2. NHS Digital. Statistics on obesity, physical activity and diet, England, 2020. 5 May 2020. https://digital.nhs.uk/data-and-information/publications/statistical/statistics-on-obesity-physical-activity-and-diet/england-2020/part-3-adult-obesity-copy.
3. Factors associated with COVID-19-related death using OpenSAFELY
4. Intensive Care National Audit and Research Centre. ICNARC report on COVID-19 in critical care. 24 Jul 2020. https://www.icnarc.org/Our-Audit/Audits/Cmp/Reports.