Esophagitis, Peptic

• Minia University Hospitals - Department of Surgery, Faculty of Medicine, Minia University — Minya, Minya Governorate, Egypt

• Zaduo County People's Hospital — Yushu, Qinghai, China

• Shanghai Changhai Hospital — Shanghai, Shanghai Municipality, China

• Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University — Guangzhou, Guangdong, China

• Beijing Friendship Hospital, Capital Medical Universtiy — Beijing, Beijing Municipality, China

• Northern Jiangsu People'S Hospital — Yangzhou, China

• First Affiliated Hospital of Nanjing Medical University — Nanjing, Jiangsu, China
• Moscow Clinical Scientific Center named after A.S. Loginov — Moscow, Russia

Not specified

• University of California, Irvine - UCI Medical Center — Orange, California, United States

• Northern Jiangsu People's Hospital — Yangzhou, Jiangsu, China