“Researchers examined 160 previously published meta-analyses of 1,411 animal studies on potential treatments for multiple sclerosis, stroke, Parkinson’s disease, Alzheimer’s disease and spinal cord injury, all done on more than 4,000 animals. Just eight showed evidence of strong, statistically significant associations using evidence from more than 500 animals. Only two studies seemed to lead to ‘convincing’ data in randomized controlled trials in humans, it said. The rest showed a range of problems, from poor study design, to small size, to an overarching tendency toward publishing only studies in which positive effects could be reported.”

http://www.rawstory.com/rs/2013/07/16/medical-research-on-animals-often-biased-scientists-warn/

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