Using a confrontational style honed in the ring, Dr. Christopher Nowinski challenges the N.F.L. and other leagues to acknowledge the link between concussions and chronic traumatic encephalopathy.
The British Journal of Sports Medicine has retracted nine non-research articles, authored by former editor-in-chief Dr Paul McCrory, on charges of plagiarism.An 'expression of concern' will also be placed on 38 others published in BMJ journals, .
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