1. Department of Gastroenterology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
2. Department of Laboratory Medicine, Clinical Microbiology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
3. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
4. Department of Gastroenterology and Hepatology, Linköping University Hospital, Linköping, Sweden
5. Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden