They were led to this finding by increasing evidence from the more modern brain scanners that chronic migraine sufferers exhibit permanent damage to their brains.

• 两位医生之所以得出上述结论，是因为他们发现用更加先进的大脑扫描仪所提供的越来越多的证据表明，慢性偏头痛患者表现出永久性脑损伤。