- Correspondence to Dr Jonathan M Snowden, Department of Obstetrics & Gynecology, Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Mail Code L466, Portland, Oregon 97239, USA;
- Received September 13, 2013
- Revised February 24, 2014
- Accepted March 9, 2014
- First published March 31, 2014.
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