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:

A replication and extension of the PEERS intervention : examining effects on social skills and social anxiety in adolescents with autism spectrum disorders . This study aimed to evaluate the Program for the Education and Enrichment of Relational Skills ( PEERS : Laugeson et al . in J Autism Dev Disord 39 ( 4 ) :596-606 , 2009 ) . PEERS focuses on improving friendship quality and social skills among adolescents with higher-functioning ASD . 58 participants aged 11-16 years-old were randomly assigned to either an immediate treatment or waitlist comparison group . Results revealed , in comparison to the waitlist group , that the experimental treatment group significantly improved their knowledge of PEERS concepts and friendship skills , increased in their amount of get-togethers , and decreased in their levels of social anxiety , core autistic symptoms , and problem behaviors from pre-to post-PEERS . This study provides the first independent replication and extension of the empirically-supported PEERS social skills intervention for adolescents with ASD .
{"Intervention": ["waitlist", "PEERS", "PEERS social skills intervention", "immediate treatment", "waitlist comparison group", "Program for the Education and Enrichment of Relational Skills ( PEERS :", "PEERS intervention :", "experimental treatment"], "Outcome": ["knowledge of PEERS concepts and friendship skills", "amount of get-togethers", "core autistic symptoms", "social skills", "problem behaviors from pre-to post-PEERS", "friendship quality", "levels of social anxiety", "social anxiety"], "Participant": ["adolescents with higher-functioning ASD .", "adolescents with ASD .", "adolescents with autism spectrum disorders ."]}