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Schorge, John O.; Halvorson, Lisa M.; Schaffer, Joseph I.; Corton, Marlene M.; Bradshaw, Karen D.; Hoffman, Barbara L. (2016-04-22). Williams gynecology. Schorge, John O.,, Hoffman, Barbara L.,, Bradshaw, Karen D.,, Halvorson, Lisa M.,, Schaffer, Joseph I.,, Corton, Marlene M. (Third ed.). New York. p. 65. ISBN9780071849081. OCLC944920918.{{cite book}}: CS1 maint: location missing publisher (link)