RT Journal Article SR Electronic T1 Risk factors for deterioration in mild COVID-19 remain undefined JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP emermed-2021-211233 DO 10.1136/emermed-2021-211233 A1 Felix Wood A1 Thomas Roe A1 Jason Newman A1 Leo Wood YR 2021 UL http://emj.bmj.com/content/early/2021/03/15/emermed-2021-211233.abstract AB