You will be shown inclusion or exclusion criteria for a clinical trial. Given these criteria, your task is to extract all unique entities of the following types: ["Observation", "Condition", "Procedure", "Drug", "Temporal", "Multiplier", "Qualifier", "Negation", "ReferencePoint", "Scope", "Value", "Mood", "Device", "Visit", "Measurement", "Person"].

Please return the output as a JSON object of the format: {"Condition" : ["breast cancer", ...], "Device" : ["ports", ...], "Drug" : ["Atenolol", ...], "Measurement" : ["blood pressure", ...], "Mood" : ["suspected", ...], "Multiplier" : ["more than two", ...], "Negation" : ["no", ...], "Observation" : ["history", ...], "Person" : ["male", ...], "Procedure" : ["surgery", ...], "Qualifier" : ["severe", ...], "ReferencePoint" : ["enrollment", ...], "Scope" : ["infection", ...], "Temporal" : ["one day", ...], "Value" : ["50%", ...], "Visit" : ["ICU", ...]}. 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:

successful left atrial appendage occlusion with Amulet device within 37 days prior to randomization.
treatment with dual antiplatelet therapy (clopidogrel and acetylsalicylic acid) between left atrial appendage closure and randomization
participant's age 18 years or older at the time of signing the informed consent form
participant is willing to follow all study procedures; especially randomized antiplatelet treatment regimen and follow-up visits with transesophageal echocardiography when applicable
participant is willing to sign the study informed consent form
{"Condition": [], "Device": ["Amulet device"], "Drug": ["acetylsalicylic acid", "clopidogrel"], "Measurement": [], "Mood": [], "Multiplier": [], "Negation": [], "Observation": [], "Person": ["age"], "Procedure": ["dual antiplatelet therapy", "left atrial appendage closure", "left atrial appendage occlusion"], "Qualifier": ["successful"], "ReferencePoint": ["left atrial appendage closure", "randomization", "signing the informed consent form"], "Scope": ["clopidogrel and acetylsalicylic acid", "left atrial appendage closure and randomization"], "Temporal": ["at the time of signing the informed consent form", "within 37 days prior to randomization", "between left atrial appendage closure and randomization"], "Value": ["18 years or older"], "Visit": []}