Diagnostic significance of SARS-CoV-2 IgM positive/IgG negative antibody profile in symptomatic patients with suspected COVID-19 testing negative by RT-PCR. Issue 1 (January 2021) - Valdivia, Arantxa; Torres, Ignacio; Huntley, Dixie; Alcaraz, María Jesús; Albert, Eliseo; González, Carmelo; Colomina, Javier; Navarro, David