RT Journal Article SR Electronic T1 Ulcerative pyoderma gangrenosum JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1058 OP E1058 DO 10.1503/cmaj.190721 VO 191 IS 38 A1 Sander, Megan A1 Sander, Michael YR 2019 UL http://www.cmaj.ca/content/191/38/E1058.abstract AB