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Editorial for issue 2 of 2014, Journal of Evidence Based Medicine

Welcome to the second issue of the seventh volume of the Journal of Evidence Based Medicine. We are pleased to continue with our mixture of articles from China and elsewhere, and our coverage of various aspects of evidence based health care. The articles from China include a broad assessment of studies of capsule endoscopy in the diagnosis of small bowel diseases. This describes four health technology assessments, 11 systematic reviews or meta-analyses, two randomised trials, five guidelines and ten economic studies. The volume of research in some areas is also illustrated for the use of radiofrequency ablation versus hepatic resection for small hepatocellular carcinoma, with the quality of a total of 19 systematic reviews being assessed. We also include some new reviews in this issue, with a rapid assessment review of the benefits and harms of the Da Vinci surgical system compared with open procedures and laparoscopic procedures, and a systematic review of the effects of tolerogenic dendritic cells (Tol-DCs) induced by different methods on liver transplantation and their possible mechanisms of action. These reviews are complemented by our usual summary of an issue of The Cochrane Library. This time it is from April 2014, when 27 new Cochrane Reviews and 35 updates were published. The authors of recent updates of Cochrane Reviews on brain stimulation techniques for chronic pain and hip protectors for preventing fractures in older people also present their findings, in their own words. In another article from China, the evidence from a retrospective study of 5000 patients from the West China Hospital examines the association between blood groups and five common cancers. From other countries, Joseph Ricci and Naman Desai from Boston in the USA describe evidencebased medicine in plastic surgery, and Dawid Pieper and colleagues from Cologne in Germany report a study showing that the choice of a critical appraisal tool has no impact on the result of evidence synthesis.