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Contraception. 2001 Oct;64(4):209-15. doi: 10.1016/s0010-7824(01)00252-9.

Periodic abstinence and calendar method use in Hungary, Peru, the Philippines, and Sri Lanka.

d'Arcangues C, Kennedy KI

https://doi.org/10.1016/s0010-7824(01)00252-9

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