1. Department of Gastroenterology, Faculty of Medicine and Health; Örebro University; Örebro Sweden
2. Department of Internal Medicine; Ersta Hospital; Stockholm Sweden
3. Department of Microbiology; Tumor and Cell Biology & Science for Life Laboratory, Karolinska Institute; Solna Sweden
4. Division for Family Medicine; Karolinska Institute; Stockholm Sweden
5. Stress Research Institute, Stockholm University; Stockholm Sweden
6. Clinical Epidemiology and Biostatistics, Faculty of Medicine and Health; Örebro University; Örebro Sweden