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Fertil Steril. 1985 Aug;44(2):185-9. doi: 10.1016/s0015-0282(16)48733-9.
Early luteal serum progesterone concentrations are higher in pregnancy cycles.
Yovich JL, McColm SC, Yovich JM, Matson PL
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Fertil Steril. 1985 Aug;44(2):185-9. doi: 10.1016/s0015-0282(16)48733-9.
Yovich JL, McColm SC, Yovich JM, Matson PL