Covid-19 vaccines work but other factors play a relevant role: a data analysis on spread and mortality in 24 countries by Mauro Giovanni Carta, Germano Orrù, Giulia Cossu, Fernanda Velluzzi, Laura Atzori, Cesar Ivan Aviles Gonzalez, Ferdinando Romano, Roberto Littera, Luchino Chessa, Davide Firinu, Stefano Del Giacco, Angelo Restivo, Simona Deidda, Alessandra Scano, Simona Onali, Goce Kalcev, Ferinando Coghe, Luigi Minerba

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