Lippincott, Williams & Wilkins, Obstetrics & Gynecology, 4, Part 1(82), p. 504-508, 1993
DOI: 10.1097/00006250-199310010-00006
Lippincott, Williams & Wilkins, Obstetrics & Gynecology, 4(82), p. 504-508, 1993
DOI: 10.1097/00006250-199310000-00006
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