RT Journal Article SR Electronic T1 The mathematics of Crohn disease JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1143 OP E1143 DO 10.1503/cmaj.180764 VO 190 IS 38 A1 Suzanne Edison YR 2018 UL http://www.cmaj.ca/content/190/38/E1143.abstract