Fig. 3From: Anodal frontal tDCS for chronic cluster headache treatment: a proof-of-concept trial targeting the anterior cingulate cortex and searching for nociceptive correlatesAttack frequency, attack duration and number of attack treatments during 4 weeks of daily tDCS (means ± sem). Significant changes (p < 0.05) from baseline are respectively indicated for each item (*), (†), (‡)Back to article page