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 observations on the treatment of hookworm , Ascaris and Trichuris infection with oxibendazole ] . 340 cases of hookworm infection , 196 cases of ascariasis and 178 cases of trichuriasis were treated with an anthelmintic , oxibendazole , 15mg/kg.d x 3d ; 102 , 70 and 66 cases of respective infections were treated with pyrantel 10mg/kg.d x 3d and 108 , 74 and 63 cases took placebo for comparison and as control under double-blind observations . Re-examinations of the stool were performed after the treatment . Among the cases treated with oxibendazole , the egg negative conversion rates of hookworm , Ascaris and Trichuris were 70.3-80.6 % , 92.5-97.8 and 67.0-71.0 % respectively . The egg reduction rates of hookworm were 98.1-98.6 % . The larval negative conversion rates of Ancylostoma duodenale and Necator americanus were 77.7 and 83.2 % respectively . Among the cases treated with pyrantel , the egg negative conversion rates of the three above mentioned parasites were 73.5 , 90.0 and 28.8 % respectively . The egg reduction rate of hookworm was 98.8 % . Among the cases treated with placebo , the egg negative conversion rates of the three above mentioned parasites were 6.5 , 29.7 and 7.9 % . No marked adverse reactions were observed by clinical and laboratory examinations .
{"Intervention": ["pyrantel", "oxibendazole", "anthelmintic , oxibendazole", "placebo"], "Outcome": ["egg negative conversion rates of hookworm", "larval negative conversion rates of Ancylostoma duodenale and Necator americanus", "egg reduction rate of hookworm", "egg negative conversion rates", "egg reduction rates of hookworm", "Ascaris", "Trichuris"], "Participant": ["196", "ascariasis", "trichuriasis", "respective infections", "Trichuris infection", "178", "hookworm", "Ascaris", "340", "hookworm infection"]}