这项回顾性研究包括了50岁以上的长期疗养所的老人。 他们在1990年到2008年间接受VPA治疗，并且至少有一次有记录的血小板计量。
The study included retrospectively identified residents of a long-term care facility who were over age 50 years, received VPA between 1990 and 2008, and had at least 1 recorded platelet count.
长期负债按照历史成本原则计量。
Long-term liabilities are measured in accordance with historical cost principle.
测量系统的校准周期是计量领域长期研究的问题。
Instrument calibration interval is a topic of long-term research in measurement field.
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