About the Authors

Jiangwei Sun

Roles Conceptualization, Formal analysis, Investigation, Methodology, Software, Visualization, Writing – original draft, Writing – review & editing

jiangwei.sun@ki.se

Affiliation Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Bjorn Roelstraete

Roles Methodology, Writing – original draft, Writing – review & editing

Affiliation Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Emma Svennberg

Roles Writing – original draft, Writing – review & editing

Affiliation Department of Medicine Huddinge, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden

Jonas Halfvarson

Roles Writing – original draft, Writing – review & editing

Affiliation Department of Gastroenterology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden

Johan Sundström

Roles Writing – original draft, Writing – review & editing

Affiliations Department of Medical Sciences, Uppsala University, Uppsala, Sweden, The George Institute for Global Health, University of New South Wales, Sydney, Australia

Anders Forss

Roles Writing – original draft, Writing – review & editing

Affiliations Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden, Department of Gastroenterology, Dermatovenereology and Rheumatology, Gastroenterology unit, Karolinska University Hospital, Stockholm, Sweden

Ola Olén

Roles Writing – original draft, Writing – review & editing

Affiliations Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden, Sachs’ Children and Youth Hospital, Stockholm South General Hospital, Stockholm, Sweden, Department of Clinical Science and Education Södersjukhuset, Karolinska Institutet, Stockholm, Sweden

Jonas F. Ludvigsson

Roles Conceptualization, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Writing – original draft, Writing – review & editing

Affiliations Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden, Department of Pediatrics, Örebro University Hospital, Örebro, Sweden, Division of Digestive and Liver Disease, Department of Medicine, Columbia University Medical Center, New York, United States of America

Competing Interests

ES has served as a speaker and/or advisory board member (all institutional grants) for Bayer, Bristol-Myers Squibb-Pfizer, Boehringer- Ingelheim, Johnson & Johnson, Merck Sharp & Dohme. JH served as speaker and/or advisory board member for AbbVie, Aqilion, BMS, Celgene, Celltrion, Dr Falk Pharma and the Falk Foundation, Ferring, Galapagos, Gilead, Hospira, Index Pharma, Janssen, MEDA, Medivir, MSD, Novartis, Pfizer, Prometheus Laboratories Inc., Sandoz, Shire, Takeda, Thermo Fisher Scientific, Tillotts Pharma, Vifor Pharma, UCB and received grant support from Janssen, MSD and Takeda. JS reports stock ownership in Anagram kommunikation AB and Symptoms Europe AB, outside the current study. AF has served as a speaker and advisory board member for Janssen. OO has been PI on projects at Karolinska Institutet financed by grants from Janssen, Pfizer, AbbVie, Takeda, Bristol Myer Squibb and Ferring, and Karolinska Institutet has received fees for lectures and participation on advisory boards from Janssen, Ferring, Galapagos, Bristol Myer Squibb, Takeda, and Pfizer. OO also reports grants from Pfizer, Janssen, Galapagos, and AbbVie in the context of a national safety monitoring programs. JFL has coordinated a study on behalf of the Swedish IBD quality register (SWIBREG). That study received funding from Janssen corporation. JFL has also received financial support from MSD developing a paper reviewing national healthcare registers in China. JFL is currently discussing potential research collaboration with Takeda. The other authors have declared that no competing interests exist.