1. Institution of Clinical and Experimental Medicine (IKE); Faculty of Health Sciences; Division of Gastroenterology; Linköping University; Linköping; Sweden
2. Psychology Department; Macquarie University; Sydney; NSW; Australia
3. Faculty of Health; University of Newcastle; Callaghan; NSW; Australia
4. Department of Gastroenterology; Karolinska Institutet; Stockholm; Sweden
5. Centre for Family Medicine; Karolinska Institutet and Stress Research Institute; Stockholm University; Stockholm; Sweden
6. Centre for Family Medicine; Karolinska Institutet; Stockholm; Sweden