HIGHLIGHTS
SUMMARY
Some clinical questions, such as "Do patients suffer BPPV before migraine onset?" and "If a patient had been diagnosed with BPPV, will the exposure to BPPV increase the risk of migraine in the patient?" arose. The authors included comorbidities before the index date as the baseline comorbidities, including hypertension (ICD-9-CM codes 401-405), diabetes_mellitus (ICD-9-CM code 250), hyperlipidemia (ICD-9-CM code 272), anxiety (ICD-9-CM codes 300.0, 300.2, 300.3, 308.3, and 309.81), and depression (ICD-9-CM codes 296.2-296.3, 300 . . .
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