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Fertil Steril. 1987 Apr;47(4):570-3. doi: 10.1016/s0015-0282(16)59104-3.
Premenstrual fall of plasma beta-endorphin in patients with premenstrual syndrome.
Facchinetti F, Martignoni E, Petraglia F, Sances MG, Nappi G, Genazzani AR
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