Non-Erosive Reflux Disease

• Department of Veterans Affairs Medical Center — Kansas City, Missouri, United States
• Queen Medical Center — Nottingham, United Kingdom

• Korea University Ansan Hospital — Seoul, South Korea

Not specified

• Seoul National University Bundang Hospital — Seongnam-si, Bundang-gu, South Korea
• Inje University Busan Paik Hospital — Busan, Busanjin-gu, South Korea
• Seoul Metropolitan Government Seoul National University Boramae Medical Center — Seoul, Dongjak-gu, South Korea
• Chonbuk National University Hospital — Jeonju, Jeonju-si, South Korea

• Shanghai East Hospital — Shanghai, Shanghai Municipality, China

• Dong-A University Hospital — Busan, South Korea
• Kosin University Gospel Hospital — Busan, South Korea
• Soonchunhyang University Cheonan Hospital — Cheonan, South Korea
• Chungbuk National University Hospital — Cheongju-si, South Korea

• Yeouido St.Mary's Hospital — Seoul, South Korea

• Yale New Haven Hospital — New Haven, Connecticut, United States
• VACHS — West Haven, Connecticut, United States

• Ecuadorian Institute of Digestive Diseases, Omnihospital — Guayaquil, Guayas, Ecuador

• Catholic yeouido sungmo hospital — Seoul, South Korea
• DongA university hospital — Busan, South Korea
• Kyungbook University hospital — Daegu, South Korea
• Chungnam university hospital — Daejeon, South Korea