Funding: the study was supported under the State Assignment by the Ministry of Health of Russia, #AAAA–A19–119021190051–6, #122040800163–9

Acknowledgments: the authors express their gratitude to all patients who participated in the study, as well as to colleagues from the department of concomitant injury, anesthesiology and resuscitation of the Research Institute of Emergency Pediatric Surgery and Traumatology of the Moscow Department of Health for their cooperation.

Author contribution: Zakirov RSh, Karaseva OV, Petrichuk SV — study planning, analysis of literature, collection of experimental data, analysis and interpretation of the results, manuscript authoring and editing; Semikina EL — study planning; Kuptsova DG, Freidlin EV — collection of experimental data.

Compliance with the ethical standards: the study was approved by the Ethics Committee of the Institute of Urgent Children Surgery and Traumatology of the Department of Health of Moscow (Minutes #2 of May 26, 2020). Parents of all participants of the study have signed the informed consent form in accordance with the principles of the Declaration of Helsinki.