RT Journal Article SR Electronic T1 Dear Mrs. P JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E168 OP E169 DO 10.1503/cmaj.181235 VO 191 IS 6 A1 Siu Yu Zoe Lau YR 2019 UL http://www.cmaj.ca/content/191/6/E168.abstract