- Correspondence to Manon JNL Benders, Perinatal Center, University Medical Center Utrecht, Perinatal Center, Lundlaan 6, KE 04.123.1, PO box 85090, 3508 AB, Utrecht, The Netherlands;
- Received May 16, 2011
- Accepted October 12, 2011
- First published November 17, 2011.
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