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=== References ===
 
=== References ===
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#Alan H. DeCherney, Lauren Nathan, T. Murphy Goodwin, Neri Laufer. Current Diagnosis & Treatment Obstetrics & Gynecology, Tenth Edition. McGraw Hill Professional, 2007. ISBN-13: 978-0-07-143900-8
 
#Alan H. DeCherney, Lauren Nathan, T. Murphy Goodwin, Neri Laufer. Current Diagnosis & Treatment Obstetrics & Gynecology, Tenth Edition. McGraw Hill Professional, 2007. ISBN-13: 978-0-07-143900-8