1. University Medical Unit, Colombo South Teaching Hospital, Kalubowila, Sri Lanka
2. Department of Surgery, Faculty of Medical Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
3. Department of Surgery, Faculty of Medicine, University of Colombo, Sri Lanka
4. Department of Medicine, Faculty of Medical Sciences, University of Sri Jayewardenepura, Nugegoda, Sri Lanka