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:

Clinical efficacy of fluvoxamine and functional polymorphism in a serotonin transporter gene on childhood autism . We studied the correlation between response to fluvoxamine and serotonin transporter gene promoter region polymorphism ( 5-HTTLPR ) . Eighteen children with autistic disorder completed a 12-week double-blind , placebo-controlled , randomized crossover study of fluvoxamine . Behavioral assessments were obtained before and at 12 weeks of treatment . 5-HTTLPR ( long ( l ) or short ( s ) ) , was analyzed by the PCR method . Ten out of 18 patients responded to fluvoxamine treatment ; allele type analysis revealed that clinical global effectiveness was noted significantly more in the l allele than in the s allele . However , with respect to language use , a significant effectiveness was noted in the s allele . 5-HTTLPR may influence the individual responses to fluvoxamine administration .
{"Intervention": ["fluvoxamine", "placebo-controlled"], "Outcome": ["language use", "Behavioral assessments", "allele type analysis"], "Participant": ["childhood", "autism", "autistic disorder", "children", "Eighteen"]}