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Efficacy of natural family planning methods.
Eur J Contracept Reprod Health Care 15(5):381-2 (2010) PMID 20863263
DOI: 10.3109/13625187.2010.514082
Version: za2963e q8za3 q8zb5 q8zc8 q8zd7 q8ze3 q8zff q8zg3
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Eur J Contracept Reprod Health Care 15(5):381-2 (2010) PMID 20863263
DOI: 10.3109/13625187.2010.514082
Contraception 75(6 Suppl):0 (2007) PMID 17531611