1 Centre for Pharmacoepidemiology, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
2 Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
3 Division of Gastroenterology, Department of Specialist Medicine, Danderyd Hospital, Stockholm, Sweden.
4 Department of Chronic Diseases, Norwegian Institute of Public Health, Oslo, Norway.
5 Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway.
6 Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, Massachusetts, USA.
7 Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.
8 Department of Women's Health, Division of Obstetrics, Karolinska University Hospital, Stockholm, Sweden.
9 Centre of Public Health Sciences, Faculty of Medicine, University of Iceland, Reykjavík, Iceland.