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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Kay C. R., Smith A., Richards B. Smoking habits of oral contraceptive users. Lancet. 1969 Dec 6;2(7632):1228–1229. doi: 10.1016/s0140-6736(69)90756-9. [DOI] [PubMed] [Google Scholar]