Sanjeev Kumar Verma1, Saurabh Karmakar2. 1. Department of Pulmonary Medicine, King George's Medical University, Lucknow, Uttar Pradesh, India. 2. Department of Pulmonary Medicine, Era's Lucknow Medical College and Hospital, Lucknow, Uttar Pradesh, India. E-mail: dr_saurabh123@rediffmail.com.