- Correspondence to Dr Jonathan M Snowden, Department of Obstetrics & Gynecology/Public Health & Preventive Medicine, Oregon Health & Science University, 3181 SW Sam Jackson, Mail Code: L-466, Portland, OR 97239, USA;
- Received January 14, 2016
- Revised June 14, 2016
- Accepted June 17, 2016
- First published July 29, 2016.
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