1. Department of Medicine, Dow University of Health Sciences, Karachi, 74200, Pakistan
2. Department of Medicine, Allama Iqbal Medical College, Lahore, 79180, Pakistan
3. Department of Surgery, Hayatabad Medical Complex, Peshawar, 25124, Pakistan
4. Department of Medicine, Quetta Institute of Medical Sciences, Balochistan, 87300, Pakistan
5. Department of Medicine, Karachi Medical & Dental College, Karachi, 74600, Pakistan
6. Department of Medicine, East & North Hertfordshire NHS Trust, SG1 4AB, UK
7. Department of Surgery, Ziauddin Medical Hospital, Karachi, 74700, Pakistan
8. Department of Internal Medicine, University of California Riverside School of Medicine, CA 92521, USA
9. Division of Cardiology, Department of Medicine, University of Louisville School of Medicine, Louisville, KY 40202, USA