Natural family planning. Natural methods have cross cultural appeal

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Billings, J. J. (1993). Natural family planning. Natural methods have cross cultural appeal. BMJ (Clinical Research Ed.), 307(6915), 1357. https://doi.org/10.1136/bmj.307.6915.1357-b

Billings JJ. Natural family planning. Natural methods have cross cultural appeal. BMJ. 1993;307(6915):1357. doi:10.1136/bmj.307.6915.1357-b

Billings, J. J. "Natural family planning. Natural methods have cross cultural appeal." BMJ (Clinical Research Ed.), vol. 307, no. 6915, 1993, pp. 1357.

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