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55,977 items of data are available, covering 55,977 participants, encoded using Data-Coding 1021.
Counts of participants/items last updated 23 Oct 2021.
Question asked: Do you or did you develop any of the following warning symptoms before or near the onset of your headache? I develop tiredness, yawning, concentration problems, changes in mood or appetite, irritability, neck stiffness, light or sound sensitivity.