“…Of included studies 46% (13/28) included both hospitalised and nonhospitalised populations, while 29% (8/28) followed up people who were not hospitalised, and 25% (7/28) were cohorts of hospitalised patient post-discharge. Control groups included population testing negative (39.3%, 11/28) [34,39,40,44,46,47,51,55,56,59,61], healthcare workers testing negative (21.4%, 6/28) [35,37,38,42,43,52], historic cohorts (14.3%, 4/28) [45,49,53,58], healthy controls (10.7%, 3/28) [41,48,54], both negative and untested population (7.1%, 2/28) [50,60], and cohorts with influenza (3.5%, 1/28) [57] and sepsis (3.5%, 1/28) [36]. Only 32% (9/28) of studies reported ethnicity of the participants [34,39,41,49,54,56,57,59,61].…”