1. School of Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
2. Faculty of Medicine and Health, University Health Care Research Center, Örebro University, Örebro, Sweden
3. Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden
4. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
5. Unit of Integrative Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
6. Department of Internal Medicine, Division of Gastroenterology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden