L Wang, NA Berger, DC Kaelber, PB Davis, ND Volkow… - 2022 - cabidigitallibrary.org
This cohort study included a total of 651,640 children younger than 5 years:(1) the Omicron
cohort with 22,772 children;(2) the Delta cohort, with 66,692 children; and (3) the Delta2 …