????? ???? ?? ???? 18?? ???? ???? ???? ????? ??, ???? ?? ?? ?? ???? ??? ??.
??? 97??? ?????? ????? ?? ????? ??? ??.
??? ??? ???? ?????? ??? ????? ???? ?? ??? ??? ??? ? 4? ??? ??? ??? ?? ??.
??? ???? ?? ??????? ??? ??? ??? ???? ? ????????(CDC)? ??? ???? ????? ??????? ????? ???? ???? ???? ???? ?? ???? ????? ???? ??? ? ‘??? ??? ?? ????? ??’? ??? ??.
?? ???, ????, ???? ???? ??, ???? ?? ???? 200??? ??? ????? ??? ? ?????? ‘??? ???’? ????.
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