- 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 16 February 2017
- Revised 6 April 2017
- Accepted 8 April 2017
- Published online 19 July 2017.
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