1. American Psychiatric Association (1980) Diagnostic and statistical manual of mental disorder.DSM-III (third edn)
2. Essen-Möller E, Larsson H, Uddenberg CE, White G (1956) Individual traits and morbidity in a Swedish rural population. Acta Psychiatr Neurol Scand [Suppl] 100
3. Garraway WM, Whisnant JP, Furlan AJ, Phillips II LH, Kurland LT, O'Fallon WM (1979) The declining incidence of stroke. New Engl J Med 9:449?451
4. Gruenberg EM (1978) Epidemiology of senile dementia. In: Schoenberg BS (ed) Neurological epidemiology: principles and clinical application. Raven Press, New York, pp 437?455
5. Hagnell O (1961) Epidemiologi och åldrande. Sv Läkartidn 58:492?499