Shkolnikov, Vladimir M; Klimkin, Ilya; McKee, Martin; Jdanov, Dmitri A; Alustiza-Galarza, Ainhoa; Németh, László; Timonin, Sergey A; Nepomuceno, Marília R; Andreev, Evgeny M; Leon, David A; (2022) What should be the baseline when calculating excess mortality? New approaches suggest that we have underestimated the impact of the COVID-19 pandemic and previous winter peaks. SSM - Population Health, 18. p. 101118. ISSN 2352-8273 DOI: https://doi.org/10.1016/j.ssmph.2022.101118