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:

Bevacizumab compared with macular laser grid photocoagulation for cystoid macular edema in branch retinal vein occlusion . INTRODUCTION To evaluate the outcome of cystoid macular edema treated with intravitreal injections of bevacizumab and macular grid laser photocoagulation ( GLP ) , in patients with perfused branch retinal vein occlusion . METHODS Thirty eyes of 30 consecutive patients with cystoid macular edema secondary to nonischemic branch retinal vein occlusion were assigned to either GLP group or to intravitreal bevacizumab ( IB ) group . Complete ophthalmologic examinations were performed just before GLP and IB injection at 1 , 3 , 6 , and 12 months after treatment . Changes in logarithm of minimum angle of resolution ( logMAR ) best-corrected visual acuity ( BCVA ) , central macular thickness ( CMT ) shown by optical coherence tomography-3 were evaluated . RESULTS Baseline BCVA ( logMAR ) and CMT were , respectively , 0.89 +/- 0.13 and 650 +/- 140 microm for the GLP group , 0.87 +/- 0.16 and 690 +/- 120 microm for the IB group . After the treatment , at 1 , 3 , 6 , and 12 months in the GLP group , BCVA had improved by 0.19 , 0.22 , 0.21 , and 0.20 logMAR , CMT had decreased by 40 % , 41.3 % , 40.5 % , and 42 % . In the IB group , BCVA had improved by 0.31 , 0.32 , 0.30 , and 0.31 logMAR and CMT had decreased by 59.5 % , 59 % , 60 % , and 60.3 % . The group receiving bevacizumab had better BCVA and lower CMT values at all time points ( P < 0.05 ) . CONCLUSION Intravitreal bevacizumab injection improves BCVA and reduces CMT more than GLP . Intravitreal bevacizumab injection was well tolerated and could be used as primary treatment in patients with cystoid macular edema secondary to perfused branch retinal vein occlusion .
{"Intervention": ["GLP", "intravitreal injections of bevacizumab", "Bevacizumab", "intravitreal bevacizumab ( IB )", "IB", "bevacizumab", "macular grid laser photocoagulation ( GLP )", "macular laser grid photocoagulation"], "Outcome": ["Baseline BCVA ( logMAR ) and CMT", "Complete ophthalmologic examinations", "logMAR", "BCVA", "CMT", "logarithm of minimum angle of resolution ( logMAR ) best-corrected visual acuity ( BCVA ) , central macular thickness ( CMT ) shown by optical coherence tomography-3"], "Participant": []}