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Table 1 Key words group for CTCF retrieving and recognition

From: Enriching the international clinical nomenclature with Chinese daily used synonyms and concept recognition in physician notes

Key words group Function Example
Time Period Matching the time duration phrase. 年(year),月(month),周(week),天(day),小时(hour)…
Number Matching the numbers in describing time duration. 1,2,3,4,5,6,7,8,9,0,半(half),一(one),二(two),三(three),+(more than)…
Modifier in CTCF Some modifiers which mingled within CTCF could be ignored in the recognition task. 持续(constantly),逐渐(gradually),明显(obviously), 稍显(slightly),反复(recurrently)…
Exception with context Some phrases, even matched, were invalid with context. 抗乙肝药物(anti-HBV drugs), 多尿期(the polyuria stage),最高血压(the highest blood pressure)…