Cochrane Overviews of reviews (Overviews) are intended to summarize multiple Cochrane Reviews are systematic reviews. In systematic reviews we search for and summarize studies that answer a specific research question (e.g. is paracetamol effective and safe for treating back pain?). The studies are identified, assessed, and summarized by using a systematic and predefined approach. They inform recommendations for healthcare and research. More addressing the effects of two or more potential interventions (for example a drug, surgery, or exercise) for a single condition or health problem.