In Sweden, all hospital admissions since 1978 are registered in the National Patient Register (NPR) and classified according to the International Classification of Diseases (ICD 8 until 1986; ICD 9 until 1996, ICD 10 since 1997 and continuing). At each examination, information about hospitalizations, medication and morbidity was obtained. During follow-up, death certificates, autopsy reports, and medical records were obtained and studied for all participants. Follow-up will be continues for each of the original 798 participants until death. New examinations will be performed every 5-10 years during follow-up.