RT Journal Article SR Electronic T1 Delays in testing as a source of COVID-19 false-negative results JF Canadian Family Physician JO Can Fam Physician FD The College of Family Physicians of Canada SP e298 OP e301 DO 10.46747/cfp.6612e298 VO 66 IS 12 A1 Rudy Zimmer YR 2020 UL http://www.cfp.ca/content/66/12/e298.abstract AB