University of Kelaniya - Faculty of Medicine, University of Kelaniya - Faculty of Medicine, Sri Lanka Society of Gastroenterology, University of Kelaniya - Faculty of Medicine, District Gerenal Hospital, Natrional Hospital, Natrional Hospital, University of Kelaniya - Faculty of Medicine, Natrional Hospital, University of Kelaniya - Faculty of Medicine, District General Hospital, North Colombo Teaching Hospital, Natrional Hospital, University of Jaffna, National Hospital of Sri Lanka, University of Colombo, University of Colombo, Colombo South Teaching Hospital, University of Kelaniya - Faculty of Medicine, University of Colombo, Teaching Hospital, Teaching Hospital, Teaching Hospital, Army Hospital, Teaching Hospital, National Hospital of Sri Lanka, Teaching Hospital, University of Kelaniya - Faculty of Medicine and University of Kelaniya - Faculty of Medicine