Effects of psychology and extragastrointestinal symptoms on health care use by subjects with and without irritable bowel syndrome

- McNaughton, David T.; Andreasson, Anna; Ljótsson, Brjánn; Beath, Alissa P.; Hush, Julia M.; Talley, Nicholas J.; Ljunggren, Gunnar; Schmidt, Peter T.; Agréus, Lars; Jones, Michael P.