1 Institute of Pulmonology, Medical Research and Development, Mumbai, Maharashtra, India ; Lung Care and Sleep Centre, Fortis Hospitals, Mumbai, Maharashtra, India.
2 Institute of Pulmonology, Medical Research and Development, Mumbai, Maharashtra, India ; Department of Medicine, Kantonsspital Liestal, University of Basel, Basel, Switzerland. E-mail: prashant.chhajed@lungcare.in.