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Table 1 Structured question

From: Occipital nerve stimulation for non-migrainous chronic headaches: a systematic review protocol

Population -Adult patients with chronic headache
Intervention -Occipital nerve stimulation
Comparator -Any comparator
Primary outcome -Pain relief
Secondary outcomes -Headache frequency, intensity, and duration -Functional status -Quality of life -Return to work -Medication use -Healthcare utilization -Complications
Study designs -Any observational or intervention design