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Contraception. 2008 Mar;77(3):147-54. doi: 10.1016/j.contraception.2007.11.001.

Being strategic about contraceptive introduction: the experience of the Standard Days Method.

Gribble JN, Lundgren RI, Velasquez C, Anastasi EE

https://doi.org/10.1016/j.contraception.2007.11.001

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