1. Department of Cardiology, Holy Family Hospital, Rawalpindi Medical University , Rawalpindi , Pakistan
2. Department of Pediatrics, Fauji Foundation Hospital, Foundation University Medical College , Islamabad , Pakistan
3. Nursing Department, Hamad Medical Corporation , Doha , P.O. Box 3050 , Qatar
4. Department of Cardiology, Benazir Bhutto Hospital, Rawalpindi Medical University , Rawalpindi , Pakistan