DOI:
10.1055/s-00000020
Geburtshilfe und Frauenheilkunde
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References
Fu H, Darroch JE, Haas T, Ranjit N.
Contraceptive failure rates: new estimates from the 1995 National Survey of Family Growth.
Fam Plann Perspect 1999; 31: 56-63
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