title: Authors' reply.
authors.affiliation: Department of Pulmonary Medicine, T. N. Medical College, B. Y. L. Nair Hospital, Mumbai, Maharashtra, India E-mail: drjoshijm@gmail.com.
authors.forename: Makaresh
authors.initials: M
authors.lastname: Yadav
authors.affiliation: Department of Pulmonary Medicine, T. N. Medical College, B. Y. L. Nair Hospital, Mumbai, Maharashtra, India E-mail: drjoshijm@gmail.com.
authors.forename: Sneha
authors.initials: S
authors.lastname: Tirpude
authors.affiliation: Department of Pulmonary Medicine, T. N. Medical College, B. Y. L. Nair Hospital, Mumbai, Maharashtra, India E-mail: drjoshijm@gmail.com.
authors.forename: Jyotsna M
authors.initials: JM
authors.lastname: Joshi