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:

Randomized trial of partial vs. stepwise caries removal : 3-year follow-up . This randomized , multicenter clinical trial evaluated the effectiveness of 2 treatments for deep caries lesions - partial caries removal ( PCR ) and stepwise excavation ( SW ) - with respect to the primary outcome of pulp vitality for a 3-year follow-up period . Inclusion criteria were as follows : patients with permanent molars presenting deep caries lesions ( lesion affecting ≥ 1/2 of the dentin on radiographic examination ) , positive response to a cold test , absence of spontaneous pain , negative sensitivity to percussion , and absence of periapical lesions ( radiographic examination ) . Teeth randomly assigned to PCR ( test ) received incomplete caries removal and filling in a single session . Outcome success was evaluated by assessment of pulp vitality , determined by pulp sensitivity to a cold test and the absence of periapical lesions . Data were analyzed by a Weibull regression model with shared frailty term ( survival analysis ) . At baseline , 299 treatments were executed : PCR , 152 and SW , 147 . By the end of the 3-year follow-up period , 213 teeth had been evaluated . Adjusted survival rates were 91 % for PCR and 69 % for SW ( p = 0.004 ) . These results suggest that there is no need to re-open a cavity and perform a second excavation for pulp vitality to be preserved ( Clinical trials registration NCT00887952 ) .
{"Intervention": ["partial caries removal ( PCR ) and stepwise excavation ( SW )", "stepwise", "partial"], "Outcome": [], "Participant": ["caries", "permanent molars presenting deep caries lesions ( lesion affecting \u2265 1/2 of the dentin on radiographic examination", "deep caries lesions", "299"]}