1. Intensive Care Unit, Bellvitge University Hospital, Feixa Llarga, S/N, Hospitalet de Llobregat, 08907 Barcelona, Spain
2. Bronchoscopy Department, Bellvitge University Hospital, Feixa Llarga, S/N, Hospitalet de Llobregat, 08907 Barcelona, Spain
3. Forensic Laboratory, Institute of Legal Medicine of Catalunya, Gran Via de les Corts Catalanes 111, 08075 Barcelona, Spain