Definitions of severely mentally and physically disabled children in Japan: do the differences affect the prevalence rates of these children?

Nakada Y, Kamiya K, Takaesu E, Ohshiro S, Hokama T, Nakasone S, Hirayama K. Definitions of severely mentally and physically disabled children in Japan: do the differences affect the prevalence rates of these children?. Acta Paediatr Jpn. 1996; 38(3): 229-32.