Concussion
Table:
Concussion
Other names	Mild brain injury, mild traumatic brain injury (mTBI), mild head injury (MHI), minor head trauma

Acceleration (g-forces) can exert rotational forces in the brain, especially the midbrain and diencephalon.
Specialty	Emergency medicine, neurology
Symptoms	Headache, trouble with thinking, memory or concentration, nausea, blurry vision, sleep disturbances, mood changes[1]
Duration	Up to 4 weeks[2]
Causes	Motor vehicle collisions, falls, sports injuries, bicycle accidents[3][4]
Risk factors	Drinking alcohol[5]
Diagnostic method	Based on symptoms[6]
Prevention	Helmets when bicycling or motorbiking[3]
Treatment	Physical and cognitive rest for a day or two with a gradual return to activities[7][2]
Medication	Paracetamol (acetaminophen), NSAIDs[2]
Frequency	6 per 1,000 people a year[3]

With reference to the table, judge whether the statement is entailed, neutral, or refuted according to the table. Output only the JSON object {"answer": "YOUR ANSWER"}.

Claim: Concussion came out in the United States before being shown at AFI fest.

answer: refuted