University of Kelaniya - Faculty of Medicine, University of Kelaniya - Faculty of Medicine, affiliation not provided to SSRN, Colombo North Center for Liver Diseases, District Gerenal Hospital, Natrional Hospital, Natrional Hospital, affiliation not provided to SSRN, Natrional Hospital, University of Kelaniya - Faculty of Medicine, District General Hospital, North Colombo Teaching Hospital, Natrional Hospital, University of Jaffna, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Colombo, Colombo South Teaching Hospital, University of Kelaniya - Faculty of Medicine, University of Colombo, Teaching Hospital, affiliation not provided to SSRN, Teaching Hospital, affiliation not provided to SSRN, affiliation not provided to SSRN, Teaching Hospital, National Hospital of Sri Lanka, Teaching Hospital, University of Kelaniya - Faculty of Medicine and University of Kelaniya - Faculty of Medicine