Não informado. (2002). ACOG Practice Bulletin. American College of Obstetricians and Gynecologists.
Citace podle Chicago (17th ed.)Não informado. ACOG Practice Bulletin. Washington: American College of Obstetricians and Gynecologists, 2002.
Citace podle MLA (8th ed.)Não informado. ACOG Practice Bulletin. American College of Obstetricians and Gynecologists, 2002.
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