[1] Charles Univ Prague, Dept Neurol, Sch Med 2, Memory Disorders Unit, CR-11636 Prague 1, Czech Republic
[2] Acad Sci Czech Republic, Inst Phys, Dept Neurophysiol Memory, Prague, Czech Republic
[3] Charles Univ Prague, Inst Phys, Sch Med 2, CR-11636 Prague, Czech Republic
[4] Charles Univ Prague, Dept Psychiat, Sch Med 1, CR-11636 Prague 1, Czech Republic
[5] Dept Clin Biochem Haematol Immunol, Homolka Hosp, Prague, Czech Republic
[6] Ctr Gerontol, Prague, Czech Republic