RT Journal Article SR Electronic T1 Rigler triad in gallstone ileus JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E690 OP E690 DO 10.1503/cmaj.121432 VO 185 IS 14 A1 Dessie Roothans A1 Sébastien Anguille YR 2013 UL http://www.cmaj.ca/content/185/14/E690.abstract AB