Ability of procalcitonin to distinguish between bacterial and nonbacterial infection in severe acute exacerbation of chronic obstructive pulmonary syndrome in the ICU oleh Cédric Daubin, François Fournel, Fabrice Thiollière, Fabrice Daviaud, Michel Ramakers, Andréa Polito, Bernard Flocard, Xavier Valette, Damien Du Cheyron, Nicolas Terzi, Muriel Fartoukh, Stephane Allouche, Jean-Jacques Parienti, from the PROCALCIVIR and BPCTrea study group