text: Classification can be related to time-of-onset or to<unk>  severity. Time-of-onset classification divides GvHD into acute or chronic, based on the key time point of 100 days. Severity classification divides GvHD into stages and grades, as defined by the International Bone Marrow Transplant Registry (IBMTR). The ultimate grade of GvHD is determined by the stages of the individual organs affected. Grade 1 GvHD, for example, is characterized by skin involvement but without liver or GI involvement.
option_0: Graft-versus-host disease classification
option_1: Tuberculosis classification
option_2: Mast cell tumor classification
option_3: Neutropenia classification
option_4: Hemosiderosis classification
option_5: Graft-versus-host disease laboratory findings
option_6: Cellulitis classification
option_7: GRADE system classification scheme