Correspondence to Sir Iain Chalmers, James Lind Initiative, Summertown Pavilion, Middle Way, Oxford OX2 7LG, UK; ichalmers{at}jameslind.net We are surrounded by maelstroms of claims about the effects ...

Correspondence to Dr E H Morreim, Internal Medicine, The University of Tennessee Health Science Center College of Medicine Memphis, Memphis, TN 38103, USA; hmorreim{at}uthsc.edu To advance healthcare ...

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Survival analysis is routinely used to assess differences between groups in relapse prevention and treatment discontinuation studies involving people with long-term psychiatric conditions. The actual ...

Background Enzyme-inducing antibacterial drugs can impair the efficacy of hormonal contraceptives. Suspicion that other antibiotics might do likewise led to advice that extra contraceptive precautions ...

Registration of health and medical research is an effective way of improving the transparency and credibility of evidence. Registration involves pre-specifying the research objectives, design, methods ...

Correspondence to Professor Paul Glasziou, Instiute for Evidence Based Heathcare, Bond University, Robina, Queensland, Australia; pglaszio{at}bond.edu.au Without this visual information in figure 1, ...

Correspondence to Dr Jian-peng Huang, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China; hopis{at}sina.com Objectives To assess the relative ...

Correspondence to Emma Grundtvig Gram, Centre and Research Unit for General Practice, University of Copenhagen Department of Public Health, Copenhagen, Denmark; emma.gram{at}sund.ku.dk All tests ‘(…) ...