biff stulgis
brain bleed
dartmouth-hitchcock study
dr. andrew crockett
dr. eleah porter
helmet use reduces some types of injury
intracranial hemorrhage
mitch wertlieb
protect against skull fractures
sam gale rosen
serious headinjuries went up with helmet use
skihelmetsskihelmets don't preventsevereheadinjuries
trauma surgeons
vpr news
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