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:

Efficacy of omeprazole versus high-dose famotidine for prevention of exercise-induced gastritis in racing Alaskan sled dogs . BACKGROUND Omeprazole and famotidine both reduce severity of exercise-induced gastritis , but administering famotidine is easier than administering omeprazole during racing competition . HYPOTHESIS Famotidine is more efficacious than no treatment in reducing severity of exercise-induced gastritis ; and high-dose famotidine is more efficacious than omeprazole in reducing severity of exercise-induced gastritis . ANIMALS Experiment 1 : Randomized placebo-controlled study , 36 sled dogs ( 3-8 years ) ; Experiment 2 : Randomized positive-control study , 52 sled dogs ( 2-8 years ) . METHODS Experiment 1 : Equal numbers of dogs randomly assigned to famotidine ( 20 mg q24h ) or no treatment groups . Gastroscopy was performed 24 hours after the dogs ran 330 miles . Mucosal appearance was blindly scored by previously described scoring system . Experiment 2 : Equal numbers of dogs randomly assigned to omeprazole ( 20 mg q24h ) or high-dose famotidine ( 40 mg q12h ) groups . Gastroscopy was performed 48 hours before and 24 hours after the dogs ran 300 miles . Mucosal appearance was blindly scored by previously described scoring system . RESULTS Famotidine reduced the prevalence of clinically relevant , exercise-induced gastric lesions compared with no treatment ( 7/16 versus 11/16 , P = .031 ) . Compared with high-dose famotidine , omeprazole significantly decreased the severity ( 0.4 versus 1.2 , P = .0002 ) and prevalence ( 2/23 versus 7/21 , P = .049 ) of gastric lesions . CONCLUSIONS AND CLINICAL RELEVANCE Although famotidine provides some benefit in the prevention of exercise-induced gastric lesions , omeprazole is superior to famotidine in preventing gastritis in dogs running 300 miles . Routine administration of omeprazole is recommended to prevent stress-associated gastric disease in exercising and racing Alaskan sled dogs .
{"Intervention": ["Omeprazole", "famotidine", "high-dose famotidine", "no treatment", "omeprazole", "Famotidine"], "Outcome": ["clinically relevant , exercise-induced gastric lesions", "gastric lesions .", "Mucosal appearance", "exercise-induced gastric lesions", "stress-associated gastric disease", "exercise-induced gastritis", "gastritis", "prevalence", "severity"], "Participant": ["36", "racing Alaskan sled dogs", "52"]}