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:

Parent management training and Asperger syndrome : a randomized controlled trial to evaluate a parent based intervention . This controlled trial of a parent management intervention aimed to increase parental competence in management of problem behaviours associated with Asperger syndrome . The intervention compared two formats , a 1 day workshop and six individual sessions . Measures were taken on three occasions : pre-intervention , at 4 weeks , and at 3 month follow-up . Variables of interest were number and intensity of problem behaviours , and parent evaluation of social interaction skills . Results showed parents reporting fewer and lower intensity of problem behaviours and increased social interactions at 4 weeks and 3 months . Results held across formats and suggest that parent management training can provide an effective intervention for parents of a child with Asperger syndrome . Group differences on outcome measures and in the use of strategies are discussed along with limitations of the study .
{"Intervention": ["Parent management training", "parent based intervention", "1 day workshop and six individual sessions .", "parent management intervention"], "Outcome": ["number and intensity of problem behaviours", "parent evaluation of social interaction skills", "effective intervention for parents of a child with Asperger syndrome", "increased social interactions", "parent based intervention", "intensity of problem behaviours"], "Participant": ["Parent management training and Asperger syndrome :", "Asperger syndrome", "parent based", "child"]}