????:1????????:?????

2?????sn

3?????????

4??????????

5?????????

??2???????????????????20??????? (????? ?????)??(NHS)20?,????????(2??????10?16???????)????????????1160??????????????,?????????

????????????????????,????????????(2??????????????3????????9?),?????????????22%,???????????????2012??????????????1%??

????,???????????,?????????????????,???300????

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