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:

Small-diameter hysteroscopy with Versapoint versus resectoscopy with a unipolar knife for the treatment of septate uterus : a prospective randomized study . STUDY OBJECTIVE To compare 2 procedures for metroplasty : resectoscopy with monopolar knife versus small-diameter hysteroscopy fitted with a Versapoint device . DESIGN Prospective randomized study ( Canadian Task Force classification I ) . SETTING Endoscopic gynecology units at tertiary care university hospitals . PATIENTS One hundred-sixty patients with septate uterus and a history of recurrent abortion or primary infertility undergoing hysteroscopic metroplasty from 2001 to 2005 . INTERVENTIONS Hysteroscopic resection of the uterine septum performed with either a 26F resectoscope with unipolar knife ( 80 women , group A ) or a 5-mm diameter hysteroscope with Versapoint device ( 80 women , group B ) . All patients were managed expectantly , with follow-up lasting 1 year . MEASUREMENTS AND MAIN RESULTS Operative parameters ( operative time , fluid absorption , complications , need for second intervention ) and reproductive outcome parameters ( pregnancy , abortion , term and preterm delivery , modality of delivery , cervical cerclage ) were measured . Operative time and fluid absorption were significantly greater in group A than in group B ( 23.4 +/- 5.7 vs 16.9 +/- 4.7 minutes and 486.4 +/- 170.0 vs 222.1 +/- 104.9 mL , respectively ) . The cumulative complication rate was significantly lower in group B than in group A . No difference in any of the reproductive parameters was observed between the 2 groups : pregnancy and delivery rates were 70 % and 81.6 % in group A vs 76.9 % and 84 % in group B . Nine women ( 18.4 % ) from group B and 8 women ( 16 % ) from group B experienced spontaneous abortions . Most patients ( 54/82 ) delivered by cesarean section without differences according to the hysteroscopic technique used for metroplasty ( 65 % in group A vs 67.7 % in group B ) or to the gestational age ( 65.1 % of term and 68.7 % of preterm deliveries ) . CONCLUSIONS Small-diameter hysteroscopy with bipolar electrode for the incision of uterine septum is as effective as resectoscopy with unipolar electrode regarding reproductive outcome and is associated with shorter operating time and lower complication rate .
{"Intervention": ["hysteroscopy", "Small-diameter hysteroscopy with Versapoint", "resectoscopy with a unipolar knife", "small-diameter hysteroscopy fitted with a Versapoint device", "resectoscopy with monopolar knife", "5-mm diameter hysteroscope with Versapoint device", "resectoscopy", "Hysteroscopic", "26F resectoscope with unipolar knife"], "Outcome": ["reproductive parameters", "complication rate", "fluid absorption", "operative time", "operating time", "pregnancy", "cesarean section without differences", "abortion", "cumulative complication rate", "complications", "Operative time", "pregnancy and delivery rates", "spontaneous abortions", "term and preterm delivery , modality of delivery , cervical cerclage", "need for second intervention"], "Participant": ["infertility", "septate uterus", "One hundred-sixty"]}