Fig. 2From: The applicability of web-based solutions in headache epidemiology researchProportions of different primary headache diagnoses among headache sufferers in the two samples. Ep M: episodic migraine; Chr M: chronic migraine; Ep TTH: episodic tension type headache; Chr TTH: chronic tension type headache; Other prim: other primary headaches; TAC: trigeminal autonomic cephalalgiasBack to article page