1. Department of Cardiothoracic Surgery, Dayanand Medical College, Ludhiana, India
2. Department of Cardiology, All India Institute of Medical Sciences Bathinda, Bathinda, India
3. Department of Cardiology, Dayanand Medical College, Ludhiana, Punjab, India
4. Department of Cardiovascular and Thoracic Surgery, Dayanand Medical College and Hospital Unit Hero DMC Heart Institute, Ludhiana, Punjab, India,