Blanchard, E. B., Keefer, L., Galovski, T. E., Taylor, A. E., & Turner, S. M. (2001). Gender differences in psychological distress among patients with irritable bowel syndrome. Journal of Psychosomatic Research, 50(5), 271–275. http://www.elsevier.com/inca/publications/store/5/2/5/4/7/4/