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1 ﹒ Sackett DL，Rosenberg WM，Gray JA，Haynes RB，Richardson WS ﹒ Evidence based medicine：what it is and what it isn ’ t ﹒ BMJ，1996，312.Population having a known probability integral has probably been drawn at random ﹒ Biometrika，1933，25 ∶ 379‐410 13 ﹒ Cochra ......