Randomised clinical trial: symptoms of the irritable bowel syndrome are improved by a psycho-education group intervention. - Labus, J.; Gupta, A.; Gill, H. K.; Posserud, I.; Mayer, M.; Raeen, H.; Bolus, R.; Simren, M.; Naliboff, B. D.; Mayer, E. A. (Alimentary Pharmacology & Therapeutics, 2013)