Barış, S. A., Yıldız, F., Başyiğit, İlknur, Boyacı, H., & Ilgazlı, A. (2019). Prevalence of smoking and chronic obstructive pulmonary disease amongst teachers working in Kocaeli, Turkey. Multidisciplinary Respiratory Medicine, 6(1). https://doi.org/10.4081/mrm.2011.434