Received: 1 May 2019
Accepted: 11 December 2019
First Online: 17 December 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by the local ethics committee of the Federal State Budgetary Institution “Research Centre for Medical Genetics” (the approval number 2018-5/4).
: Informed consent was obtained from all individual participants included in the study.