@article {Worrall1520, author = {Graham Worrall and Peggy Holmes and Megan Robbins}, title = {Bubble bubble, abdominal trouble: a new test to chew on}, volume = {161}, number = {12}, pages = {1520--1521}, year = {1999}, publisher = {CMAJ}, issn = {0820-3946}, URL = {https://www.cmaj.ca/content/161/12/1520}, eprint = {https://www.cmaj.ca/content/161/12/1520.full.pdf}, journal = {CMAJ} }