Saleem, M., Priya, S., Pradeep, M. and Sabeetha, K. 2017. A study on the prevalence of chronic obstructive pulmonary disease among adults in Madurai, Tamil Nadu. International Journal Of Community Medicine And Public Health. 4, 11 (Oct. 2017), 4113–4119. DOI:https://doi.org/10.18203/2394-6040.ijcmph20174629.