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REFERENCES

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    Sackett DL, Haynes RB, Tugwell P.. Clinical epidemiology: a basic science for clinical medicine. Boston: Little, Brown, 1985; 317.
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    Sackett DL, Haynes RB, Tugwell P. Clinical epidemiology: a basic science for clinical medicine, 1 ix.
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    Fletcher RH, Fletcher SW, Wagner EH. Clinical epidemiology: the essentials. Baltimore: Williams & Wilkins 1988; 6.
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    Fletcher RH, Fletcher SW, Wagner EH. Clinical epidemiology: the essentials, 3 vi.