- Correspondence to Dr Natalia Ustinova, 119991, Federal State Autonomous Institution "National Scientific and Practical Center of Children's Health" Of the Ministry of Health of the Russian Federation, Lomonosovsky av.2, Moscow, Russia;
- Received February 16, 2017
- Revised April 6, 2017
- Accepted April 8, 2017
- First published June 13, 2017.
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