RT Journal Article SR Electronic T1 Update to COVID-19 serologic testing : FAQs and caveats JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic DO 10.3949/ccjm.87a.20054-up A1 Kamran Kadkhoda YR 2022 UL http://www.ccjm.org/content/early/2022/01/12/ccjm.87a.20054-up.abstract AB