Groff, Paolo, Giuseppina Petrelli, Paolo Giorgini, Roberto Pilotti, Vito Maurizio Parato, and Andrea Fabbri. 2021. “Clinical Heterogeneity of a Population of Patients Admitted to the Emergency Department With a Diagnosis of COPD-Exacerbation: Relevance of Cardiovascular Comorbidities”. Emergency Care Journal 17 (1). https://doi.org/10.4081/ecj.2021.9502.