Colitis, Ulcerative

• Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul National University College of Medicine — Seoul, Dongjak-gu, South Korea

• Cedars-Sinai Inflammatory Bowel Disease Center — Los Angeles, California, United States
• Hoag Digestive Health — Newport Beach, California, United States
• UC San Diego Health Inflammatory Bowel Disease Center — San Diego, California, United States
• University of Colorado Health — Denver, Colorado, United States

• IRCCS San Donato POliclinic — San Donato Milanese, Milan, Italy

• Universitair Ziekenhuis Gent — Ghent, Belgium
• Centre hospitalier universitaire de Liège — Liège, Belgium
• Centre hospitalier régional de la Citadelle — Liège, Belgium
• Rijnstate Hospital — Arnhem, Netherlands

• Centre de recherche of the CIUSSS de l'Estrie-CHUS — Sherbrooke, Quebec, Canada

• VitaMed Research, LLC — Palm Desert, California, United States

• National Institutes of Health Clinical Center — Bethesda, Maryland, United States

Not specified

• University of North Carolina at Chapel Hill — Chapel Hill, North Carolina, United States

• Pediatric Immunohematology Unit, IRCCS Ospedale San Raffaele — Milan, Italy
• UOC Pediatria, Azienda Ospedaliero-Universitaria Sant'Andrea — Rome, Italy