Retrograde memory immediately after concussion.
D000647:Amnesia / Q000209:etiology / Q000503:physiopathology*; D001265:Athletic Injuries / Q000150:complications*; D001924:Brain Concussion / Q000150:complications*; D006801:Humans; D008297:Male; D008570:Memory, Short-Term; D013312:Stress, Physiological; D013997:Time Factors