Lackner, J. M., Keefer, L., Jaccard, J., Firth, R., Brenner, D., Bratten, J., . . . Byroads, M. (2012). The Irritable Bowel Syndrome Outcome Study (IBSOS): Rationale and design of a randomized, placebo-controlled trial with 12 month follow up of self- versus clinician-administered CBT for moderate to severe irritable bowel syndrome.

Lackner, Jeffrey M., Laurie Keefer, James Jaccard, Rebecca Firth, Darren Brenner, Jason Bratten, Laura J. Dunlap, and Mark Byroads. The Irritable Bowel Syndrome Outcome Study (IBSOS): Rationale and Design of a Randomized, Placebo-controlled Trial With 12 Month Follow Up of Self- Versus Clinician-administered CBT for Moderate to Severe Irritable Bowel Syndrome. 2012.

Lackner, Jeffrey M., et al. The Irritable Bowel Syndrome Outcome Study (IBSOS): Rationale and Design of a Randomized, Placebo-controlled Trial With 12 Month Follow Up of Self- Versus Clinician-administered CBT for Moderate to Severe Irritable Bowel Syndrome. 2012.