Prospective Observational Study on Ustekinumab (Stelara) Assessing Efficacy and Healthcare Resource Utilization in Crohn's Disease

Participants that are initiated on treatment with ustekinumab and are registered in Swibreg will be recruited into the cohort. All aspects of treatment and clinical management of participants will be in accordance with local clinical practice and applicable local regulations, and at the discretion of the participating physician.