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letter

. 1993 Oct 16;307(6910):1003. doi: 10.1136/bmj.307.6910.1003

Natural family planning. Effective only if used perfectly.

PMCID: PMC1679162 PMID: 8241882

1003

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

Ryder R. E. "Natural family planning": effective birth control supported by the Catholic Church. BMJ. 1993 Sep 18;307(6906):723–726. doi: 10.1136/bmj.307.6906.723. [DOI] [PMC free article] [PubMed] [Google Scholar]
Trussell J., Grummer-Strawn L. Contraceptive failure of the ovulation method of periodic abstinence. Fam Plann Perspect. 1990 Mar-Apr;22(2):65–75. [PubMed] [Google Scholar]
Trussell J., Kost K. Contraceptive failure in the United States: a critical review of the literature. Stud Fam Plann. 1987 Sep-Oct;18(5):237–283. [PubMed] [Google Scholar]

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