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Comparison 1: Any opioid (e.g. morphine, diamorphine, fentanyl, alfentanil, sufentanil, pethidine, meperidine, codeine) compared to control (placebo or no intervention), with or without other nonâpharmacological measures, Outcome 8: Neurodevelopmental outcome at 18 to 24 months (moderate to severe disability)
