Self-report underestimates the frequency of the acute respiratory exacerbations of COPD but is associated with BAL neutrophilia and lymphocytosis: an observational study oleh Yorusaliem Abrham, Siyang Zeng, Wendy Lin, Colin Lo, Alexander Beckert, Laurel Evans, Michelle Dunn, Brian Giang, Krish Thakkar, Julian Roman, Paul D. Blanc, Mehrdad Arjomandi