COVID Symptom Study
... that more than 3 million people have downloaded the COVID Symptom Study app in the UK and the US?
... that more than 3<span id="mwBhU" typeof="mw:Entity"> </span>million people have downloaded the <b id="mwBhY"><a class="mw-redirect" href="./COVID_Symptom_Study" id="mwBhc" rel="mw:WikiLink" title="COVID Symptom Study">COVID Symptom Study</a></b> app in the UK and the US?