- Correspondence to Dr Lee P Shulman, Department of Obstetrics and Gynecology, Prentice Women's Hospital, 250 E. Superior Street, Room 05-2174, Chicago, IL 60611, USA;
- Received February 4, 2013
- Revised April 2, 2013
- Accepted April 3, 2013
- First published May 24, 2013.
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