Department of Gastroen-terology and Hepatology;
Okayama University Graduate School of Medicine;
Dentistry;
and Pharmaceutical Sciences;
Department of Internal Medicine;
Tsuyama Chuo Hospital;
Department of Internal Medicine;
Hiroshima City Hospital;
Department of Gastroenterology;
Mitoyo General Hospital;
Department of Internal Medicine;
Okayama Saiseikai General Hospital;
Department of Gastroenterology;
Shikoku Cancer Center;
Department of Gastroenterology;
Kagawa Prefectural Central Hospital;
Department of Gastroenterology;
Onomichi Municipal Hospital;
Department of Gastroenterology;
Fukuyama Medical Center;
Department of Pathology;
Okayama University Hospital;
Department of Pathology;
Okayama University Graduate School of Medicine;
Dentistry;
and Pharmaceutical Sciences;
Extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue; Gastric neoplasms; Esophagogastroduodenoscopy; t(11; 18) translocation; Trisomy 18;