Clinical and social characterization of patients hospitalized for COPD exacerbation using Machine Learning tools Manuel Casal-Guisande; Cristina Represas-Represas; Rafael Golpe-Gómez; Alberto Fernández-García; Almudena González-Montaos; Alberto Comesaña-Campos; Alberto Ruano-Raviña; Alberto Fernández-Villar;