RT Journal Article SR Electronic T1 Amateur boxing and risk of chronic traumatic brain injury: systematic review of observational studies JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 864 OP 867 VO 42 IS 11 A1 Mike Loosemore A1 Charles H Knowles A1 Greg P Whyte YR 2008 UL http://bjsm.bmj.com/content/42/11/864.abstract AB