1. Department of Community Medicine and Behavioural Sciences, Faculty of Medicine, Kuwait University, P.O. Box 24923, 13110 Safat, Kuwait
2. Department of Pediatrics, Faculty of Medicine, University of British Columbia, Room L408, 4480 Oak Street, Vancouver, BC, Canada V6H 3V4
3. School of Population and Public Health, University of British Columbia, Canada V6T 1Z3
4. Division of Cardiology, University of British Columbia, St. Paul's Hospital, 1081 Burrard Street, Vancouver, BC, Canada V6Z 1Y6