The project, including source code: <a href="https://opensafely.org/" rel="nofollow">https://opensafely.org/</a><p>Press release: <a href="https://opensafely.org/press-releases/2020/05/covid-risk-factors/" rel="nofollow">https://opensafely.org/press-releases/2020/05/covid-risk-fac...</a><p>Paper (not yet peer-reviewed): <a href="https://www.medrxiv.org/content/10.1101/2020.05.06.20092999v1" rel="nofollow">https://www.medrxiv.org/content/10.1101/2020.05.06.20092999v...</a><p>Interesting part of the thread about how they did it without putting patients' data at risk: <a href="https://twitter.com/bengoldacre/status/1258431405450833921" rel="nofollow">https://twitter.com/bengoldacre/status/1258431405450833921</a>