Tetikkurt, C.; Ozdemir, I.; Tetikkurt, S.; Yılmaz, N.; Ertan, T.; Bayar, N. Anxiety and Depression in COPD Patients and Correlation With Sputum and BAL Cytology. Multidiscip Respir Med 2019, 6 (1). https://doi.org/10.4081/mrm.2011.444.