Fig. 1From: Tracking tDCS induced grey matter changes in episodic migraine: a randomized controlled trialOverview of the study design. The observation period was subdivided into six 28-day periods (Baseline, T1–5). The tDCS treatment was performed during T1 and was initiated immediately after the baseline visit. FUP1 was scheduled shortly after the end of the stimulation period and FUP2 after T5. Modified from Pohl et al. [32]Back to article page