- Correspondence to Catarina Rodrigues, Department of Obstetrics and Gynaecology, University Medical Center Groningen, Hanzeplein 1, postbus 30.001, 9700 RB Groningen, The Netherlands;
- Received May 8, 2012
- Revised November 30, 2012
- Accepted December 18, 2012
- First published January 24, 2013.
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