Endoscopy

• Alabama Digestive Disorders Center — Huntsville, Alabama, United States
• Division of Gastroenterology Indiana University Medical Center — Indianapolis, Indiana, United States
• Research Associates of New York — New York, United States
• University of North Carolina Division of Digestive Disease — Chapel Hill, North Carolina, United States

Not specified

• Royal Hallamshire Hospital — Sheffield, South Yorkshire, United Kingdom

• Oral and Maxillofacial Surgery, Barzilai Medical Center — Ashkelon, Israel

• Helen Keller Hospital — Sheffield, Alabama, United States
• HOPE Research Institute — Phoenix, Arizona, United States
• Advanced Clinical Research Institute — Anaheim, California, United States
• Miami Research Associates — South Miami, Florida, United States

• Kinderkrankenhaus Amsterdamer Straße — Cologne, North Rhine-Westphalia, Germany
• Asklepios Kinderklinik Sankt Augustin — Sankt Augustin, North Rhine-Westphalia, Germany
• Erasmus Medical Center, Sophia Children's Hospital — Rotterdam, Netherlands
• University Children's Hospital — Zurich, Switzerland

• Ahmed Abbas — Assiut, Cairo Governorate, Egypt

• Groupe Hospitalier Paris Saint Joseph — Paris, Île-de-France Region, France

• VA Palo Alto Health Care System — Palo Alto, California, United States

• VA Connecticut Healthcare System — West Haven, Connecticut, United States