DOI: 10.1055/s-00030576

Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics

References

Fleiss JL, Tytun A, Ury HK.
A simple approximation for calculating sample sizes for comparing independent proportions.

Biometrics 1980;
36 (02) 343-346 . Doi: 10.2307/2529990

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