Prevalence of SARS-CoV-2 in Spain (ENE-COVID): a nationwide, population-based seroepidemiological study Pollán, MarinaBlanco, Faustino et al. The Lancet, Volume 0, Issue 0 Published:July 06, 2020 DOI:https://doi.org/10.1016/S0140-6736(20)31483-5