Mortality and survival in nonagenarians during the COVID-19 pandemic: Unstable equilibrium of aging by Daria A. Kashtanova, Veronika V. Erema, Maria S. Gusakova, Ekaterina R. Sutulova, Anna Yu. Yakovchik, Mikhail V. Ivanov, Anastasiia N. Taraskina, Mikhail V. Terekhov, Lorena R. Matkava, Antonina M. Rumyantseva, Vladimir S. Yudin, Anna A. Akopyan, Irina D. Strazhesko, Irina S. Kordiukova, Alexandra I. Akinshina, Valentin V. Makarov, Olga N. Tkacheva, Sergey A. Kraevoy, Sergey M. Yudin

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