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:

Influence of two different flap designs on the sequelae of mandibular third molar surgery . PURPOSE The aim of this study was to compare the influence of triangular and envelope flaps on trismus , pain , and facial swelling after mandibular third molar surgery . METHODS Twenty healthy patients with bilateral , symmetrically impacted mandibular third molars were included in this double-blinded , prospective , cross-over , randomized study . The patients were operated with envelope flap on one side and triangular flap on the other side . Trismus was determined by measuring maximum interincisal opening , and facial swelling was evaluated using a tape measuring method . Pain was determined using visual analog scale ( VAS ) and recording the number of pain pills taken . RESULTS The facial swelling measurements and VAS scores were lower in the envelope flap group compared to the triangular flap group . There was no significant difference between the two flap designs in operation time , maximum interincisal opening , and the number of analgesics taken . CONCLUSION Envelope flap yields to less facial swelling and reduced VAS scores in comparison to triangular flap . There is no clinical difference in trismus between the two flap designs . Despite the higher VAS scores with triangular flap , no additional doses of analgesics were required in triangular flap .
{"Intervention": ["visual analog scale ( VAS ) and recording the number of pain pills taken", "operated with envelope flap on one side and triangular flap on the other side . Trismus was determined by measuring maximum interincisal opening , and facial swelling was evaluated using a tape measuring method"], "Outcome": ["pain", "Pain", "operation time", "VAS scores", "trismus", "maximum interincisal opening", "facial swelling", "facial swelling measurements", "Trismus", "the number of analgesics taken"], "Participant": ["Twenty", "with bilateral , symmetrically impacted mandibular third molars", "mandibular third molar surgery"]}