Constriction, Pathologic

• O.L. Vrouwziekenhuis — Aalst, Belgium
• CHIREC du Clinique — Brussels, Belgium
• ULB Hopital Erasme — Brussels, Belgium
• CHC St. Joseph — Liège, Belgium

• University of Damascus — Damascus, Syria

Not specified

• Southwest Vascular Center — Tempe, Arizona, United States
• Alliance Research Centers — Laguna Hills, California, United States
• Radiology Imaging Associates — Englewood, Colorado, United States
• Yale University & Yale New Haven Hospital — New Haven, Connecticut, United States

• Kwang Sup Song — Seoul, South Korea

• Mayo Clinic in Arizona — Scottsdale, Arizona, United States
• Sharp HealthCare — San Diego, California, United States
• Zuckerberg San Francisco General — San Francisco, California, United States
• Mayo Clinic in Florida — Jacksonville, Florida, United States

• Singapore General Hospital — Singapore

• ULB Erasme Hospital — Brussels, Belgium
• Hopital Edouard Herriot — Lyon, Cedex 3, France
• EVK Krankenhaus der Universitat Dusseldorf — Düsseldorf, Germany
• Asian Institute of Gastroenterology — Hyderabaad, India

• Westmead Hospital — Westmead, New South Wales, Australia

• Singapore General Hospital — Singapore