Clinical Evidence is an international source of the the best available evidence on the effects of common clinical interventions. It provides a concise account of the contemporary state of knowledge, ignorance and uncertainty about the prevention and treatment of a wide range of common clinical conditions, based on searches and appraisal of the literature. Its practical question-driven approach means it can be used by anyone making decisions about patient care. It is updated every six months in full and concise editions, and monthly on the Web. This concise edition contains the original full text in a combined pocket book and CD-ROM package. The slim pocket book includes the summary and background information for each topic. The accompanying CD-ROM contains the full topic, including access to the evidence detail, references, figures and appendices.