RT Journal Article SR Electronic T1 Challenges in evaluating SARS-CoV-2 vaccines during the COVID-19 pandemic JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E982 OP E985 DO 10.1503/cmaj.201237 VO 192 IS 34 A1 Abu-Raya, Bahaa A1 Gantt, Soren A1 Sadarangani, Manish YR 2020 UL http://www.cmaj.ca/content/192/34/E982.abstract