DescriptionCochrane is a global independent network of researchers, professionals, patients, carers and people interested in health. We are a not-for-profit organization working together to produce credible, accessible health information that is free from commercial sponsorship and other conflicts of interest. We do this by producing reviews that summarise the best available evidence generated through research to inform decisions about health. Cochrane Reviews are systematic reviews of primary research in human health care and health policy and are internationally recognised as the highest standard in evidence-based health care. Cochrane Systematic Reviews are published online, in full text, in the Cochrane Database of Systematic Reviews in the Cochrane Library – www.cochranelibrary.com. Cochrane UK is one of 14 Cochrane Centres around the world supporting the global work of Cochrane and maximising the use and impact of Cochrane reviews for the UK and Ireland. Cochrane UK is funded by the National Institute for Health Research (NIHR) and hosted by the Oxford University Hospitals NHS Trust. The centre supports the production of Cochrane systematic reviews through a learning and development programme for Cochrane authors and other contributors. We aim to maximise the impact of Cochrane reviews by disseminating the findings widely to health professionals, researchers, commissioners, the public, charities and the media, through social media, events, presentations and partnerships.