Usefulness of lung ultrasound for selecting asymptomatic older patients with COVID 19 pneumonia oleh Chukwuma Okoye, Valeria Calsolaro, Alessandra Fabbri, Riccardo Franchi, Rachele Antognoli, Ludovica Zisca, Camilla Bianchi, Alessia Maria Calabrese, Sara Rogani, Fabio Monzani