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1 Profile of the Billings Ovulation Method acceptors and use-effectiveness of the method in Korea
Kwang Ho Meng, Kyu Sang Cho
J Korean Med Sci.1989;4(1):29-34.   Published online 2009 May 26     DOI: http://dx.doi.org/10.3346/jkms.1989.4.1.29
      

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