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This is a pre-copyedited, author-produced version of an article accepted for publication in Journal of Crohn's and Colitis following peer review. The version of record "Ossum, A. M., Palm, Ø., Lunder, A. K., Cvancarova, M., Banitalebi, H., Negård, A., ... & IBSEN Study Group Vatn Morten Borthne Arne Jahnsen Jørgen Huppertz-Hauss Gert Bernklev Tomm Kempski-Monstad Iril Solberg Inger Camilla Opheim Randi Klepp-Larsson Pascal Stray Njaal Jelsness-Jørgensen Lars Petter Hovde Øistein Bengtson May-Bente. (2017). Ankylosing spondylitis and axial spondyloarthritis in patients with long-term inflammatory bowel disease: results from 20 years of follow-up in the IBSEN study. Journal of Crohn's and Colitis, 12(1), 96-104" is available online at: 
http://dx.doi.org/10.1093/ecco-jcc/jjx126
https://academic.oup.com/ecco-jcc/article/12/1/96/4157563
Except where otherwise noted, this item's license is described as This is a pre-copyedited, author-produced version of an article accepted for publication in Journal of Crohn's and Colitis following peer review. The version of record "Ossum, A. M., Palm, Ø., Lunder, A. K., Cvancarova, M., Banitalebi, H., Negård, A., ... & IBSEN Study Group Vatn Morten Borthne Arne Jahnsen Jørgen Huppertz-Hauss Gert Bernklev Tomm Kempski-Monstad Iril Solberg Inger Camilla Opheim Randi Klepp-Larsson Pascal Stray Njaal Jelsness-Jørgensen Lars Petter Hovde Øistein Bengtson May-Bente. (2017). Ankylosing spondylitis and axial spondyloarthritis in patients with long-term inflammatory bowel disease: results from 20 years of follow-up in the IBSEN study. Journal of Crohn's and Colitis, 12(1), 96-104" is available online at: http://dx.doi.org/10.1093/ecco-jcc/jjx126 https://academic.oup.com/ecco-jcc/article/12/1/96/4157563