Funding for this research was provided by:
RFBR and CITMA (18-515-34005)
Government Assignment of the Russian Ministry of Health (AAAA-A18-118051590122-7)
Government Assignment of the Russian Ministry of Science and Higher Education (AAAA-A19-119040490101-6)
Received: 20 December 2020
Accepted: 14 January 2021
First Online: 11 February 2021
Ethics approval and consent to participate
: Our study was approved by the Ethics Committee of the Veltischev Research and Clinical Institute for Pediatrics of the Pirogov Russian National Research Medical University, Ministry of Health of Russian Federation, Moscow. Written informed consent was obtained from all the parents of the participants.
: Not applicable.
: The authors declare that they have no competing interests.