1. Department of Pulmonary and Sleep Medicine, Military Hospital Namkum, Ranchi, Jharkhand, India
2. M. D. (Respiratory Medicine), Registrar, 150 General Hospital, Rajouri, Jammu and Kashmir, India
3. Department of Pulmonary and Sleep Medicine, Command Hospital, Lucknow, Uttar Pradesh, India. E-mail: kunalgutgutia@gmail.com