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Table 2 Study eligibility criteria

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

Inclusion criteria -Randomized controlled trials, quasi-randomized trials, retrospective, and prospective observational studies -Chronic setting -At least one group of patients suffering from chronic headache -At least one group of adult patients (≥ 18 years old) -Any sample sizes -Clinical trials with at least one group of patients treated by occipital nerve stimulation -Studies including before and after internal control or a separate control group
Exclusion criteria -Sample of patients with migraine only -Combination of ONS and other forms of nerve stimulation