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??21-?????????21????????????19?????????John Langdon Down
?
1866????????????Mongolism????mongolian idiocy???????????????????????
1959?????(Jerome LeJeune)???21???????????
1961????The Lancet???
1965?WHO??????
???????????660????????????????2024???1/149040?1/10649?1/11?????I?????80???35?3...
?
1866????????????Mongolism????mongolian idiocy???????????????????????
1959?????(Jerome LeJeune)???21???????????
1961????The Lancet???
1965?WHO??????
???????????660????????????????2024???1/149040?1/10649?1/11?????I?????80???35?3...