RT Journal Article SR Electronic T1 COVID-19 vaccination research turns toward young children: Clinical trials involving kids underway JF The Nation's Health JO Nations Health FD American Public Health Association SP 1 OP 10 VO 51 IS 4 A1 Aaron Warnick YR 2021 UL http://www.thenationshealth.org/content/51/4/1.1.abstract AB