1 Republican Children's Rehabilitation Center, Nazarbayev University, Astana 010000, Kazakhstan; University Medical Center, Nazarbayev University, Astana 010000, Kazakhstan.
2 University Medical Center, Nazarbayev University, Astana 010000, Kazakhstan; Department of Medicine, Nazarbayev University, Astana 010000, Kazakhstan. Electronic address: sandro.vento@nu.edu.kz.