作者: Willard G. Manning , Arleen Leibowitz , George A. Goldberg , William H. Rogers , Joseph P. Newhouse
DOI: 10.1056/NEJM198406073102305
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摘要: … In addition, 733 prior enrollees of the Cooperative were studied as a control group. … in the two Cooperative groups (P<0.01 for the experimental group, P<0.05 for the control group). The …