Biliary Tract Diseases

• 4th Department of Internal Medicine,"Attikon" University Hospital, National and Kapodistrian University of Athens, Medical School — Chaïdári, Attica, Greece
• 1st Department of Internal Medicine, General Hospital of Eleusis THRIASIO — Athens, Greece
• 3rd University Department of Internal Medicine, General Hospital of Chest Diseases of Athens SOTIRIA — Athens, Greece
• 3rd Department of Internal Medicine, General Hospital of Nikaia AGIOS PANTELEIMON — Nikaia, Greece

• HonorHealth Research Insititute — Scottsdale, Arizona, United States
• Northside Hospital, Inc. — Atlanta, Georgia, United States
• Georgia Cancer Center at Augusta University — Augusta, Georgia, United States
• Oncology Hematology West, PC dba Nebraska Cancer Specialists — Omaha, Nebraska, United States

• Texas Children's Hospital and Baylor College of Medicine — Houston, Texas, United States

• People's Hospital of Xinjiang Uygur Autonomous Region — Ürümqi, Xinjiang, China

• Quotient Clinical — Ruddington, Nottingham, United Kingdom

Not specified

• Gastroenterology Department of Saint Antoine Hospital — Paris, France

Not specified

• University of Alberta — Edmonton, Alberta, Canada
• St Paul's Hospital, University of British Columbia — Vancouver, British Columbia, Canada
• Vancouver General Hospital, University of Brittish Columbia — Vancouver, British Columbia, Canada
• University of Toronto — Toronto, Ontario, Canada

• Universita' Cattolica del Sacro Cuore — Rome, Italy