Identification of non-communicable disease within the cohort. Information on diagnosis from 1987-01-01 and onwards is obtained by record linkage with the National Hospital Discharge Register (HDR), covering all public inpatient care in Sweden, and the National Hospital Outpatients Register, covering all public outpatient care in Sweden from 2003-01-01, administered the National Board of Health and Welfare in Sweden. Diagnosis were recorded using the International Classification of Diseases (ICD) version 9 (1987-1996) and version 10 (1997 and later). Deaths occurring during the study period are collected through the National Cause of Death Register, administered by the Center for Epidemiology at the National Board of Health and Welfare in Sweden.