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Reference "[18]" sometimes appears in academic citations for historical journals, such as the Diary of Anatoly S. Chernyaev or studies involving the Royal Secretary's Diary .
In clinical studies, a "[18] Diary" often refers to a standardized Sleep Diary or Symptom Diary used by participants to track adherence to a 3-session-per-day regimen. The Diary of Anatoly S. Chernyaev - 1983
The primary goal of a diary card is to create a record of your daily experiences to identify patterns between your triggers and your reactions.