Nattusamy Loganathan, Madan Karan, Khilnani Gopi C, Guleria Randeep
Department of Pulmonary Medicine and Sleep Disorders, All India Institute of Medical Sciences, New Delhi, India.
BMJ Case Rep. 2014 Jun 23;2014:bcr2014205181. doi: 10.1136/bcr-2014-205181.