Funding: this study was conducted under the state assignment for Lomonosov Moscow State University using the equipment acquired as part of the Scientific Development Program of Lomonosov Moscow State University.

Acknowledgement: the authors thank Mamedov NN, PhD Med, an Assistant Professor at the Department of Obstetrics and Gynecology (Faculty of Fundamental Medicine, Lomonosov Moscow State University) for his help in creating the collection of biosamples (umbilical cord fragments, blood samples).

Author contribution: Revina DB, Balatskiy AV, Larina EB, Samokhodskaya LM, Panina OB, Tkachuk VA — study design; Revina DB, Balatskiy AV, Larina EB, Oleynikova NA, Mishurovsky GA — collection and processing of biosamples and clinical datal; Revina DB, Balatskiy AV, Mishurovsky GA — statistical analysis; Revina DB, Balatskiy AV — interpretation of the results; Revina DB, Balatskiy AV, Oleynikova NA, Mishurovsky GA — manuscript preparation; Malkov PG, Samokhodskaya LM, Panina OB, Tkachuk VA — manuscript revision; Revina DB and Balatskiy AV equally contributed to the study.