Effectiveness of non-pharmaceutical interventions in nine fields of activity to decrease SARS-CoV-2 transmission (Spain, September 2020–May 2021) oleh Inés Barbeito, Daniel Precioso, María José Sierra, María José Sierra, Susana Vegas-Azcárate, Sonia Fernández Balbuena, Begoña Vitoriano, David Goméz-Ullate, David Goméz-Ullate, Ricardo Cao, Susana Monge, Susana Monge, the Study Group for Non-Pharmaceutical Interventions in Spain