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...Contacts robin waxenberg tamesha logan associates nata robwax com tameshal org summary comparison of the reducing intentional head first contact behavior in american football players position statement to down and spearing tackle changed title from expanded original objective which was decrease risk cervical spine fractures dislocations now prevalence with aim neck injuries added emphasis on problem derived scientific research using impact sensor technology not widely available for citations support recommendations that are assigned a level evidence corresponding strength recommendation taxonomy sort rating i e b or c retained categories rules officiating regulations education coaching administration removed category practices concepts skill development modification an overview characteristics intervention studies exposure study quality ratings table format...