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Demographic and clinical features.
| Demographic Features | |
| Sex: men/women | 8/53 |
| Age: years, mean ± SD | 50 ± 10 |
| Headache type | |
| Isolated chronic migraine | 20 (33%) |
| Chronic migraine + tension-type headache | 18 (29%) |
| Chronic migraine + medication overuse headache | 12 (20%) |
| Episodic disabling migraine | 11 (18%) |
