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This study is using QResearch, a large database of over 35 million people that has collected data from a general practice computer system called EMIS since 1989 (https://www.qresearch.org/). 

Where available, the individuals in the database have had their GP data in QResearch linked to data in the Public Health England COVID-19 test registry, hospital admissions data and the Office of National Statistics death registry. The research involves looking at data regarding age, sex, ethnicity, medical conditions, prescribed medications and lifestyle factors such as smoking, alcohol and social circumstances such as deprivation.