Saumen Nandi1, Anindya Mukherjee2, Dibbendhu Khanra3, Kaushik Biswas1. 1. Department of Cardiology, NRS Medical College, Kolkata, India. 2. Department of Cardiology, NRS Medical College, Kolkata, India. anindya768@yahoo.co.in. 3. Heart and Lung Centre, New Cross Hospital, Royal Wolverhampton NHS Trust, Heath Town, Wolverhampton, UK.