Heterogeneity levels of 0–40%, 30–60%, 50–90%, and 75–100% were categorized as “probably not significant,” “moderate heterogeneity,” “substantial heterogeneity,” and “considerable heterogeneity,” respectively [ 16 ].
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Post-dural puncture headache prevention and treatment with aminophylline or theophylline: a systematic review and meta-analysis.
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