Apolipoprotein E.EPSILON.4 Allel Frequencies, Plasma .ALPHA.2-Macroglobulin and Plasminogen Activator Inhibitor 1 Levels in Residents of a Rural Area in Gunma Prefecture - Muramatsu, Shin-ichi; Otsuka, Mieko; Ueki, Akira (Nihon Rōnen Igakkai zasshi, 1997)