The Ovulation Method: Ten Years of Research
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ovulation method research, creighton model development, billings ovulation method, cervical mucus fertility awareness, natural family planning effectiveness, fertility awareness method research, naprotechnology history, fertility charting methodology, mucus observation fertility, hilgers ovulation method, fabm clinical research
Cite this article
Hilgers, T. W. (1978). *The Ovulation Method: Ten Years of Research*.
Hilgers TW. The Ovulation Method: Ten Years of Research. 1978.
Hilgers, T. W. *The Ovulation Method: Ten Years of Research*. 1978.