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The number of patients undergoing microvascular decompression for the treatment of hemifacial spasm per 100,000 population per year was compared between 8 districts. The 47 prefectures were divided into 8 distinct districts. Overall, in Japan, 0.83 patients/100,000 population/year were treated. Among the districts, the Hokkaido district had the highest number (1.09 cases/100,000 population/year), whereas the Shikoku district had the lowest number (0.59 cases/100,000 population/year).
