Age-specific SARS-CoV-2 infection fatality ratio and associated risk factors, Italy, February to April 2020 Poletti, Piero and Tirani, Marcello and Cereda, Danilo and Trentini, Filippo and Guzzetta, Giorgio and Marziano, Valentina and Buoro, Sabrina and Riboli, Simona and Crottogini, Lucia and Piccarreta, Raffaella and Piatti, Alessandra and Grasselli, Giacomo and Melegaro, Alessia and Gramegna, Maria and Ajelli, Marco and Merler, Stefano, Eurosurveillance, 25, 2001383 (2020), https://doi.org/10.2807/1560-7917.ES.2020.25.31.2001383