Geßner, R., Reischies, F. M., Kage, A., Geiselmann, B., Borchelt, M., Steinhagen-Thiessen, E., & Köttgen, E. (1997). In an epidemiological sample the apolipoprotein E4 allele is associated to dementia and loss of memory function only in the very old. Neuroscience Letters, 222, 29-32.