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2. The use and effectiveness of seat belts;Ackroyd;Journal of Bone and Joint Surgery,1979
3. Fractures of the odontoid process. Treatment with anterior screw fixation;Aebi;Spine,1989
4. Spinal cord injury at birth;Allen,1976
5. Fractures of the odontoid process of the axis;Anderson;Journal of Bone and Joint Surgery,1974