Cochrane Library A collection of evidence-based clinical information for healthcare providers. Cochrane Database of Systematic Reviews includes systemic reviews, protocols, editorials, and supplements. Cochrane Central Register of Controlled Trials is a directory of randomized and quasi-randomized controlled trials found in scholarly literature. Cochrane Clinical Answers includes clinical questions, a short answer, and data drawn from reviews that allow clinicians to quickly obtain evidence-based information to use in point-of-care decision-making.