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:

Two to ten years : developmental trajectories of joint attention in children with ASD who received targeted social communication interventions . This study follows 40 children who were participants in a randomized controlled early intervention trial ( Kasari et al . ) from early childhood ( 2-5 years of age ) to elementary school age ( 8-10 years ) . To fully utilize the available longitudinal data , the general linear mixed model was the primary analytical approach . The growth trajectories of joint attention skills ( pointing , coordinated joint looking , and showing ) and expressive language outcomes in these children were estimated based on five time points during the measurement period . The children were grouped by diagnosis at the last follow-up ( autism , autism spectrum disorder ( ASD ) , no diagnosis ) and by their original treatment group assignment ( joint attention , symbolic play , control ) , and differences between these groups were evaluated . Results showed that joint attention skills of coordinated joint looking and showing increased over time , and pointing to share interest increased over the first year measured and decreased thereafter . These trajectories were influenced by both original treatment assignment and diagnostic status at follow-up . In addition , a cross-lagged panel analysis revealed a causal relationship between early pointing and later language development . This study highlights the longitudinal and developmental importance of measures of early core deficits in autism , and suggests that both treatment and ASD symptomatology may influence growth in these skills over time .
{"Intervention": ["targeted social communication interventions"], "Outcome": ["joint attention skills", "expressive language outcomes", "joint attention skills ( pointing , coordinated joint looking , and showing )"], "Participant": ["from early childhood ( 2-5 years of age ) to elementary school age ( 8-10 years )", "40", "children", "received targeted social communication interventions", "randomized controlled early intervention", "ASD"]}