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Fertil Steril. 1950 Jul;1(4):338-46. doi: 10.1016/s0015-0282(16)30244-8.
Time required for conception in 1727 planned pregnancies.
Guttmacher AF, Rubin S, Tietze C
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Fertil Steril. 1950 Jul;1(4):338-46. doi: 10.1016/s0015-0282(16)30244-8.
Guttmacher AF, Rubin S, Tietze C