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Lancet. 1972 Feb 5;1(7745):282-4. doi: 10.1016/s0140-6736(72)90291-7.
Symptoms and hormonal changes accompanying ovulation.
Billings EL, Brown JB, Billings JJ, Burger HG
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Lancet. 1972 Feb 5;1(7745):282-4. doi: 10.1016/s0140-6736(72)90291-7.
Billings EL, Brown JB, Billings JJ, Burger HG