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 ...

Correspondence to Dr Juan Victor Ariel Franco, Associate Cochrane Centre-Research Department, Instituto Universitario Hospital Italiano de Buenos Aires, Buenos Aires C1199, Argentina; ...

Correspondence to Professor Carl Heneghan, Primary Care Health Sciences, University of Oxford, Oxford OX1 2JD, UK; carl.heneghan{at}phc.ox.ac.uk If you wish to reuse ...

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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 ...

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 ...

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Correspondence to Dr Gillian Stokes, Social Research Institute, EPPI Centre, University College London, London, WC1H 0NS, UK; gillian.stokes{at}ucl.ac.uk Searches conducted a year or more before ...

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Correspondence to Dr Marleen Kunneman, Medical Decision Making, Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, Netherlands; kunneman{at}lumc.nl For too many people, ...