Chetambath Ravindran, Parengal Jabeed, Aslam Mohammed, Shivashankaran Sanjeev
Department of Pulmonary Medicine, DM Wayanad Institute of Medical Sciences, Wayanad, Kerala, India.
Lung India. 2018 Mar-Apr;35(2):173-175. doi: 10.4103/lungindia.lungindia_99_17.