Do patients with irritable bowel syndrome in primary care really differ from outpatients with irritable bowel syndrome?
H E van der Horst, A M van Dulmen, F G Schellevis, J Th M van Eijk, J F M Fennis, G Bleijenberg
Gut Nov 1997, 41 (5) 669-674; DOI: 10.1136/gut.41.5.669
