Gastroscopy

• Changhai Hospital — Shanghai, Shanghai Municipality, China
• The Affiliated Traditional Chinese Medicine Hospital Of Southwest Medical University — Luzhou, Sichuan, China

• Renmin Hospital of Wuhan University — Wuhan, China

• Istanbul Sultanbeyli State Hospital — Istanbul, Turkey (Türkiye)

• Odense University Hospital — Odense, Denmark

Not specified

• Toronto Western Hospital — Toronto, Ontario, Canada

• Helsiki University Central Hospital,Meilahti Hospital,Endoscopy unit — Helsinki, Uusimaa, Finland

• Herlev Hospital, Department of surgical gastroenterology — Herlev, Denmark