Crohn Disease

• Arkansas Children's Hospital — Little Rock, Arkansas, United States
• Children's Hospital of Los Angeles — Los Angeles, California, United States
• UCSF Benioff Children's Hospital Oakland — Oakland, California, United States
• Lucile Packard Children's Hospital — Palo Alto, California, United States

• Maastricht University Medical Centrer — Maastricht, Netherlands
• Zuyderland Medical Centre — Sittard, Netherlands

• Washington University in St. Louis — St Louis, Missouri, United States

• CHU de Bordeaux - service d'Hépato-gastroentérologie — Pessac, France

• University of Calgary — Calgary, Alberta, Canada
• University Aldo Moro — Bari, Italy
• University of Milan — Milan, Italy
• University Federico II — Naples, Italy

• Medical University of Vienna — Vienna, Austria

Not specified

• Aarhus University Hospital — Aarhus, Aarhus C, Denmark
• Bispebjerg Hospital — Copenhagen, Copenhagen NV, Denmark
• Nykøbing F. Sygehus — Nykøbing Falster, Nykøbing, Denmark
• Odense University hospital — Odense, Odense C, Denmark

• Stony Brook University Hospital — Stony Brook, New York, United States

• Children's Hospital of Philadelphia — Philadelphia, Pennsylvania, United States