Celli, BR; Fabbri, LM; Aaron, SD; Agusti, A; Brook, R; Criner, GJ; Franssen, FME; ... Wedzicha, JA; + view all (2021) An Updated Definition and Severity Classification of Chronic Obstructive Pulmonary Disease Exacerbations: The Rome Proposal. American Journal of Respiratory and Critical Care Medicine , 204 (11) pp. 1251-1258. 10.1164/rccm.202108-1819PP. Green open access