Department of Hematology;
Hakodate Municipal Hospital;
Department of Gastroenterology;
Ha-kodate Municipal Hospital;
Takanori Teshima;
Department of Hematology;
Hokkaido University Graduate School of Medicine;
Rituximab; Hepatitis; B; virus; Reactivation; Chemotherapy; Lamivudine; Non-Hodgkin’s; lymphoma;