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The prevalence of progressive supranuclear (PSP) and Richardson's syndrome (RS). Crude and age‐ and sex‐adjusted prevalences of PSP/RS in 1999, PSP in 2010, and RS in 2010 (adjusted to the population of Yonago City on the prevalence day of 1 April 1999). PSP was conceptually equal to RS in 1999. The subjects in 1999 included only patients with RS according to the diagnostic criteria of the NINDS‐SPSP
