Point-of-care ultrasonography in the initial characterization of patients with COVID-19 - Tung-Chen, Yale; Algora-Martin, Ana; Llamas-Fuentes, Rafael; Rodriguez-Fuertes, Pablo; Martinez Virto, Ana Maria; Sanz-Rodriguez, Elena; Alonso-Martinez, Blanca; Rivera Nunez, Maria Angelica (Medicina Clinica, 2021)