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In addition to the journal and text references listed above, the following sources were used in preparation of
this chapter.

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Yen SSC, Jaffe RB, Barbieri RL[eds.]. Reproductive Endocrinology: Physiology, pathophysiology and clinical management. Fourth edition, 1999. W.B. Saunders, Philadelphia.

Reece EA, Hobbins JC [eds.]. Medicine of the fetus and mother. Second edition, 1999. Lippincott-Raven, Philadelphia.