BMJ : British medical journal
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Meta Analysis
Analgesic efficacy and safety of paracetamol-codeine combinations versus paracetamol alone: a systematic review.
To assess whether adding codeine to paracetamol has an additive analgesic effect; to assess the safety of paracetamol-codeine combinations versus paracetamol alone. ⋯ Systematic literature review with meta-analysis, methodological quality of published trials being scored by means of 13 predefined criteria.