Oral Chinese Herbal Medicine as Prophylactic Treatment for Episodic Migraine in Adults: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

Figure 8

Funnel plot. (a) Migraine frequency at the end of treatment. (b) Migraine attack duration at the end of treatment. (c) Pain VAS at the end of treatment; VAS, visual analogue scale.

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