Postdural Puncture Headache — Incidence of Headache Following an Unintentional Dural Puncture
Citation(s)
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Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
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Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
