1999 ̱ CDC ȭ ߺ Ȳ ż ܡŽ ȿ LRN ࡤ LRN-B 5õ Ƿ ִ.
δ 2001 ̱ ź ɼ ȭʿ ⰨżӴ 2002 ˻, ߺǽ, 420 Ƿ dzƮũ ࡤϰ ִ.
δ ߺ Ȳ ɷ ȭ 2013 LRN-B , CDC ϴ ǥذ˻ þ, Ʒ żܴɷ ȭ Դ.
Ư ̹ ǥ ѱ ߺ Ȳ Žϴ ȭ ν ̱ LRN-B Ȱ뿡 Ұ,
δ ̷ LRN-B 츮 ɷ ؿ ̸ٴ ǹϸ, ƽþ 꿪 Ʈʽ ϱ µ ̰ ִٰ .
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