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:

For both groups: 
Patients aged from 18 to 65 years old. 
Both genders eligible for study. 
Female participants must use a contraceptive method. 
Feasibility of patch testing. 
Participants must be able to understand and sign the Informed Consent, and comply with all aspects of the protocol. 
Patients must be registered in a social security system or with a health insurance coverage 
 First group: allergic patients 
Patients with allergic contact dermatitis to para-phenylenediamine (PPD) based on a history of PPD contact dermatitis and positive PPD patch tests. 
 Second group : healthy volunteers 
No history of PPD allergic contact dermatitis, with a negative PPD patch test.
{"Condition": ["allergic", "contact dermatitis", "allergic contact dermatitis"], "Device": [], "Drug": ["PPD", "para-phenylenediamine (PPD)"], "Measurement": ["PPD patch tests", "PPD patch test"], "Mood": ["Feasibility of", "be able to"], "Multiplier": [], "Negation": ["No"], "Observation": ["registered in a social security system", "health insurance coverage", "healthy"], "Person": ["Female", "Both genders", "aged"], "Procedure": ["contraceptive method"], "Qualifier": [], "ReferencePoint": [], "Scope": ["PPD contact dermatitis and positive PPD patch tests", "negative PPD patch test", "understand and sign the Informed Consent, and comply with all aspects of the protocol"], "Temporal": [], "Value": ["from 18 to 65 years old", "negative", "positive"], "Visit": []}