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:

Cost effectiveness of treatment with percutaneous Kirschner wires versus volar locking plate for adult patients with a dorsally displaced fracture of the distal radius : analysis from the DRAFFT trial . We present an economic evaluation using data from the Distal Radius Acute Fracture Fixation Trial ( DRAFFT ) to compare the relative cost effectiveness of percutaneous Kirschner wire ( K-wire ) fixation and volar locking-plate fixation for patients with dorsally-displaced fractures of the distal radius . The cost effectiveness analysis ( cost per quality-adjusted life year ; QALY ) was derived from a multi-centre , two-arm , parallel group , assessor-blind , randomised controlled trial which took place in 18 trauma centres in the United Kingdom . Data from 460 patients were available for analysis , which includes both a National Health Service cost perspective including costs of surgery , implants and healthcare resource use over a 12-month period after surgery , and a societal perspective , which includes the cost of time off work and the need for additional private care . There was only a small difference in QALYs gained for patients treated with locking-plate fixation over those treated with K-wires . At a mean additional cost of £714 ( 95 % confidence interval 588 to 865 ) per patient , locking-plate fixation presented an incremental cost effectiveness ratio ( ICER ) of £89,322 per QALY within the first 12 months of treatment . Sensitivity analyses were undertaken to assess the ICER of locking-plate fixation compared with K-wires . These were greater than £30,000 . Compared with locking-plate fixation , K-wire fixation is a 'cost saving ' intervention , with similar health benefits .
{"Intervention": ["volar locking-plate fixation", "and", "locking-plate fixation", "percutaneous Kirschner wire ( K-wire ) fixation", "treatment with percutaneous Kirschner wires versus volar locking plate", "K-wires ."], "Outcome": ["QALYs", "Cost effectiveness of treatment with percutaneous Kirschner wires", "the ICER", "( cost per quality-adjusted life year ; QALY )", "additional private care .", "an incremental cost effectiveness ratio ( ICER )", "costs of surgery , implants", "healthcare resource use", "cost of time off work"], "Participant": ["dorsally-displaced fractures of the distal radius", "adult", "460", "trauma"]}