Saurabh Kumar Gupta1, Ramamoorthy Ananthakrishnan2. 1. Department of Cardiology, All India Institute of Medical Sciences, Room No. 23, 7th Floor, C N Centre, New Delhi, 110029, India. drsaurabhmd@gmail.com. 2. Department of Cardiology, All India Institute of Medical Sciences, Room No. 23, 7th Floor, C N Centre, New Delhi, 110029, India.