Characteristics and Risk Factors Associated With Mortality in a Multicenter Spanish Cohort of Patients With COVID-19 Pneumonia José Ramón Muñoz-Rodríguez; Francisco Javier Gómez-Romero; José Manuel Pérez-Ortiz; Pilar López-Juárez; Juan Luis Santiago; Leticia Serrano-Oviedo; Francisco Javier Redondo-Calvo;