Methods the data of 123 cases with symmetrical craniocerebral trauma were summarized, and their clinical characteristics and treatment were analyzed retrospectively.
方法总结123例对称性颅脑损伤患者的临床资料，对其临床特点和治疗情况进行回顾性分析。
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The answers to these questions coincide either when no heterogeneity is present, or when the distribution of the treatment effects is roughly symmetrical.