RT Journal Article SR Electronic T1 Bubble bubble, abdominal trouble: a new test to chew on JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1520 OP 1521 VO 161 IS 12 A1 Graham Worrall A1 Peggy Holmes A1 Megan Robbins YR 1999 UL http://www.cmaj.ca/content/161/12/1520.abstract