M. Kalappan, K. Rajendran, P. K. Suthakaran, P. Thangaraj, G. Ganapathy, and R. Karuthodiyil, “Study on comparison of pulmonary function tests among diabetic and non-diabetic patients in a tertiary care hospital”, Int J Adv Med, vol. 3, no. 4, pp. 938–941, Dec. 2016.