G. Goudarzi, S. Geravandi, M. J. Mohammadi, S. Salmanzadeh, M. Vosoughi, and M. Sahebalzamani, “The relationship between air pollution exposure and chronic obstructive pulmonary disease in Ahvaz, Iran”, Chron Dis J, vol. 3, no. 1, pp. 14–20, Mar. 2015.