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It has known that a prevalence of Rett syndrome (RTT) is approximately 1.0 per 10,000 females. However, we have never Japanese data. In 2010, the recent revised criterion for diagnosis of RTT was published. Here, we performed nationwide survey of RTT, according to the new criterion, to clarify the Japanese epidemiology of RTT. We selected 1,020 hospitals or institutes by stratified sampling from...
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