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1.An epidemic survey conducted in USA during 1983 ~ 1992 showed the yearly prevalence of PHPT was 20.8 / 100,000 and there was 1 PHPT patient in every 1000 outpatients in North American.
1983～1992年间美国的一项流行病学调查资料显示PHPT的年发病率为20.8／100,000，北美地区每1000例门诊患者中即有1例PHPT患者。收藏指正
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