RT Journal Article SR Electronic T1 Postpartum exacerbation of antenatal COVID-19 pneumonia in 3 women JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E603 OP E606 DO 10.1503/cmaj.200553 VO 192 IS 22 A1 An, Peng A1 Wood, Bradford J. A1 Li, Wei A1 Zhang, Min A1 Ye, Yingjian YR 2020 UL http://www.cmaj.ca/content/192/22/E603.abstract