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Usage of the most frequent diagnoses before and after intervention. G44: other headache syndromes; M79.1: (pericranial) myalgia; R51: headache; G43: migraine; G43.9: unspecified migraine; G43.x: specified migraine subtype; G44.2: tension-type headache. The figure depicts a clear trend, post-intervention, away from use of non-specific diagnoses towards more specific diagnoses
