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The largest collection of summaries of research relevant to health and well being is in The Cochrane Library, which is available on the internet (http://www.thecochranelibrary.com). It contains the complete set of Cochrane reviews, within the Cochrane Database of Systematic Reviews. This single collection of systematic reviews of the effects of healthcare interventions now has more than 3600 full Cochrane reviews. Each of these includes information on the methods used, eligible studies found, analyses done, results obtained and conclusions reached. The second issue of The Cochrane Library for 2009 was published in April. The findings of nearly 90 Cochrane reviews appeared for the first time and more than 100 of the existing reviews were updated. For 19 of these, the evidence added to the review led to important changes to its conclusions.

The new knowledge in Issue 2 of The Cochrane Library covers many areas of health and a wide variety of interventions. The new reviews include what is probably the world's most comprehensive review of topical treatments for psoriasis, with 131 randomised trials involving more than 21,000 people. There are also new Cochrane reviews of combination therapy for chronic asthma, statins for the prevention of dementia and enteral tube feeding for older people who suffer from it, music for stress and anxiety reduction in patients with heart disease, homeopathic medicines to overcome the adverse effects of cancer treatments, and the screening for alcohol and drugs of people whose work involves driving.

The new and up-dated findings also include research into maternal positions and mobility during labour, rivastigmine for Alzheimer's disease, male circumcision to prevent heterosexual acquisition of HIV in men, and, for people who have had surgery, the effects of etoricoxib for acute pain and stimulation of the wrist acupuncture point P6 to prevent postoperative nausea and vomiting.

The new and updated Cochrane reviews mentioned above have been highlighted in Evidence Pods, adding to the existing collection of more than fifty of these podcasts. The podcasts, each lasting a few minutes, are available free on the internet. They can be listened to, saved and shared from The Cochrane Collaborations website: http://www.cochrane.org/podcasts. In the following section, some of the Cochrane authors who recorded podcasts for earlier issues of The Cochrane Library tell us about their reviews.