1. Kivach Clinic, 186202 Konchezero, Russia
2. Laboratory of Metabolomic Diagnostics of Meta-Metrix, 117630 Moscow, Russia
3. Institute of Biogerontology, Lobachevsky State University of Nizhny Novgorod, 603146 Nizhny Novgorod, Russia
4. Russian Research Clinical Center of Gerontology of the Russian National Research Medical University Named after N.I. Pirogov, 129226 Moscow, Russia