RT Journal Article SR Electronic T1 Working in a bubble: How can businesses reopen while limiting the risk of COVID-19 outbreaks? JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP cmaj.201582 DO 10.1503/cmaj.201582 A1 Jeffrey Shaw A1 Troy Day A1 Nadia Malik A1 Nancy Barber A1 Hayley Wickenheiser A1 David N. Fisman A1 Isaac Bogoch A1 John I. Brownstein A1 Tyler Williamson YR 2020 UL http://www.cmaj.ca/content/early/2020/09/29/cmaj.201582.abstract