1 Inflammatory Bowel Disease Center at NYU Langone Health, Division of Gastroenterology, Department of Medicine, New York University School of Medicine, New York, New York, USA Jordan.Axelrad@nyulangone.org.
2 Clinical Epidemiology Division, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden.
3 Sachs' Children and Youth Hospital, Stockholm South General Hospital, Stockholm, Sweden.
4 Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden.
5 Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark.
6 Department of Surgery, Randers Regional Hospital, Randers, Denmark.
7 Department of Gastroenterology, Faculty of Medicine and Health, School of Health and Medical Sciences, Örebro University, Örebro, Sweden.
8 Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.
9 Department of Pediatrics, Orebro University Hospital, Örebro, Sweden.
10 Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, UK.
11 Department of Medicine, Columbia University College of Physicians and Surgeons, New York, NY, USA.