1. Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
2. Department of Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
3. Department of Pathology and Cytology, Aleris Medilab, Täby, Sweden
4. Department of Gastroenterology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden