- Correspondence to Dr Olga A Efimova, D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductology, Mendeleevskaya line, 3, St. Petersburg 199034, Russia;
- Received June 25, 2016
- Revised July 12, 2016
- Accepted July 13, 2016
- First published August 4, 2016.
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