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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Nillius S. J., Johansson E. D. Plasma levels of progesterone after vaginal, rectal, or intramuscular administration of progesterone. Am J Obstet Gynecol. 1971 Jun 15;110(4):470–477. [PubMed] [Google Scholar]