A register is maintained within the contract file to ensure that the revision status of client's specifications is recorded and controlled.
登记薄保留在合同文件中，以对客户规范的变更情况进行记录和控制。
A 1:1 matched cohort (control group) was created based on primary or revision status, length of fusion, diagnosis, and age.
按1：1选择配对群体(对照组)，配对条件包括初次或翻修手术、融合节段长度、诊断和年龄。
A 1:1 matched cohort (control group) was created based on primary or revision status, length of fusion, diagnosis, and age.
按1：1选择配对群体(对照组)，配对条件包括初次或翻修手术、融合节段长度、诊断和年龄。
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