Funding for this research was provided by:
Российский Фонд Фундаментальных Исследований (17-04-01587а, 17-29-06017 ofi_m)
Ministry of Science and Higher Education
Received: 6 March 2020
Accepted: 25 June 2020
First Online: 16 July 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Research Center for Medical Genetics. All parents signed an informed consent for conducting research.
: Not applicable.
: The authors declare that they have no competing interests.