Cochrane CollaborationThe Cochrane Collaboration, established in 1993, is an international network of more than 28,000 dedicated people from over 100 countries. We work together to help health care providers, policy-makers, patients, their advocates and carers, make well-informed decisions about health care, based on the best available research evidence, by preparing, updating and promoting the accessibility of Cochrane Reviews – over 5,000 so far, published online in The Cochrane Library.