Full text: Available Index: IMSEAR (South-East Asia) Main subject: Prognosis / Sri Lanka / Severity of Illness Index / ABO Blood-Group System / Female / Humans / Male / Retrospective Studies / Cohort Studies / Risk Assessment Type of study: Etiology study / Incidence study / Observational study / Prognostic study / Risk factors Country/Region as subject: Asia Language: English Journal: Ceylon Med J Year: 2003 Type: Article