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), pp. 4113–4119. doi: 10.18203/2394-6040.ijcmph20174629.