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PMID 8257909 8257909 DOI 10.1136/bmj.307.6915.1359-b 10.1136/bmj.307.6915.1359-b

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Odeblad, E. (1993). Natural family planning. Demand is increasing.. BMJ (Clinical research ed.), 307(6915), 1359. https://doi.org/10.1136/bmj.307.6915.1359-b