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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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13 h 1 ene 1929 año - 1929 -Van de Velde - 1st associated biphasic temp. curve with increased progesterone, correlated BBT to ovulation and higher temp curve with increased progesterone

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NFP History

ByN. Husk
12 nov 2017
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13 h 1 ene 1929 año
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~ 96 years ago
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