1. Department of Cardiology, Dayanand Medical College and Hospital, Ludhiana, India;
2. Department of Cardiac-Anaesthesia, Dayanand Medical College and Hospital, Ludhiana, India;
3. Department of Cardiothoracic Surgery, Dayanand Medical College and Hospital, Ludhiana, India;
4. Department of Medicine, Dayanand Medical College and Hospital, Ludhiana, India