The incidence and severity of COVID-19 in adult professional soccer players in Russia - Bezuglov, E.; Khaitin, V.; Lazarev, A.; Achkasov, E.; Romanova, L.; Butovskiy, M.; Khokhlov, V.; Tsyplenko, M.; Linskiy, A.; Chetverikov, P.; Sugaipov, M.; Petrov, A.; et al. (PLOS ONE, 2022)