New guidance on the conduct of clinical trials during the COVID-19 pandemic has been published by the European Commission, the European Medicines Agency and heads of national agencies in the EU. https://ec.europa.eu/health/sites/health/files/files/eudralex/vol-10/guidanceclinicaltrials_covid19_en.pdf, Developers including Eli Lilly and Co, have already announced delays in the start of studies and a pause in enrollment of ongoing studies.
