KoreaMed Synapse › Synapse › Data › PDFData › ... · vol 4, No. '1, P 29-34, Mar. 1989...
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KoreaMed Synapse › Synapse › Data › PDFData › ... · vol 4, No. '1, P 29-34, Mar. 1989 Profile of the Billings Ovulation Method Acceptors and Use-effectiveness of the Method