Spinal Cord DiseasesBone Marrow ExaminationBone RegenerationSpinal CordMuscular Atrophy, SpinalBone MarrowSpinal Cord InjuriesSMN Complex ProteinsSurvival of Motor Neuron 1 ProteinBiopsy, NeedleLymphohistiocytosis, HemophagocyticBone Marrow CellsPancytopeniaBone and BonesRibonucleoproteins, Small NuclearHistiocytosis, Non-Langerhans-CellSternumBone Marrow NeoplasmsPneumonia, AspirationMotor NeuronsRespiratory AspirationBone Marrow Transplantation