Cite
HARVARD Citation
Pyper, C. (1993). Natural family planning. Low failure rate with symptothermal method.. BMJ. 307 (6915), pp. 1359-1360. [Online].
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Pyper, C. (1993). Natural family planning. Low failure rate with symptothermal method.. BMJ. 307 (6915), pp. 1359-1360. [Online].