You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Outcome", "Participant", "Intervention"].

Please return the output as a JSON object of the format: {"Participant" : ["patients with COPD", ...], "Intervention" : ["Atenolol", ...], "Outcome" : ["blood pressure", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Granulocyte-macrophage colony-stimulating factor as immunomodulating factor together with influenza vaccination in stem cell transplant patients . The effect of granulocyte-macrophage colony-stimulating factor ( GM-CSF ) on the serological response at influenza vaccination was studied in 117 patients who had undergone stem cell transplantation ( SCT ) . The vaccine response was evaluated as significant increases in levels of influenza hemagglutination-inhibition ( HAI ) antibodies and of IgG antibodies measured by enzyme-linked immunosorbent assay ( ELISA ) . There was no difference in antibody response to either influenza A or B in 64 patients who received GM-CSF at vaccination , compared with the 53 who did not . In the subgroup of allogeneic SCT patients , HAI showed that the response rate to the influenza B vaccine was significantly higher in the treatment group ( P < .05 ) . ELISA showed that autologous SCT patients with breast cancer who received GM-CSF had a better response to influenza A ( P < .05 ) and B ( P < .01 ) . At early vaccination , 4-12 months after stem cell transplantation , these responses were more pronounced . GM-CSF appears to improve the response to influenza vaccination in some groups of SCT patients , but only to a limited extent .
{"Intervention": ["influenza vaccination", "GM-CSF", "Granulocyte-macrophage colony-stimulating factor", "granulocyte-macrophage colony-stimulating factor ( GM-CSF )", "influenza B vaccine"], "Outcome": ["serological response", "levels of influenza hemagglutination-inhibition ( HAI ) antibodies", "ELISA", "vaccine response", "antibody response", "influenza A", "IgG antibodies", "influenza vaccination"], "Participant": ["SCT", "stem cell transplant", "117", "SCT patients", "undergone stem cell transplantation"]}