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Lancet. 1972 Oct 14;2(7781):813-6. doi: 10.1016/s0140-6736(72)92164-2.

A trial of the ovulation method of family planning in Tonga.

Weissmann MC, Foliaki L, Billings EL, Billings JJ

Source:

https://doi.org/10.1016/s0140-6736(72)92164-2

PubMed:

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