cd20 positive lymphomacd20 positive follicular lymphomacd20 positive non hodgkin's lymphomacd3 and cd20 positive lymphomacd30 cd20 positive lymphomacd10 b cell lymphomamonoclonal b cell lymphomab cell lymphocytic lymphomafollicular b cell lymphomaextranodal b cell lymphomalarge b cell lymphoma prognosisb cell malignant lymphoma