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:

1. Age: 18-75 years old, no limitation in gender; 
2. Left ventricular ejection fraction (LVEF) ≤ 40% (ECHO); 
3. Patients with chronic heart failure (NYHA class II or III); 
4. In the past one month, the clinical condition (including history, clinical symptoms and signs) was relatively stable; 
5. Patients on standard treatment of chronic heart failure at the target dose or maximum tolerance dose for over 1 month ,or unchanged dose in last 1 month; 
6. Understand and sign the informed consent form;
{"Condition": ["clinical symptoms", "chronic heart failure", "clinical signs"], "Device": [], "Drug": [], "Measurement": ["NYHA", "Left ventricular ejection fraction (LVEF)"], "Mood": [], "Multiplier": [], "Negation": [], "Observation": ["maximum tolerance dose", "history", "target dose", "unchanged dose"], "Person": ["Age"], "Procedure": ["treatment of chronic heart failure", "ECHO"], "Qualifier": ["relatively stable"], "ReferencePoint": [], "Scope": ["target dose or maximum tolerance dose for over 1 month ,or unchanged dose in last 1 month", "history, clinical symptoms and signs", "target dose or maximum tolerance dose"], "Temporal": ["in last 1 month", "In the past one month", "for over 1 month"], "Value": ["\u2264 40%", "18-75 years", "class II or III"], "Visit": []}