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Study design. One-way cross-over clinical trial design. Patients were divided into episodic and chronic migraine groups based on the number of headache days per month. Patients with migraine were assigned to the control white light emitting diode (WLED) first then crossed over to the green light emitting diode (GLED) therapy. After 10 weeks of daily WLED, patients underwent a 2 week “washout” period and were then crossed over to the GLED.
