[1] Natl Inst Hlth, Natl Inst Geriatr, Mexico City, Mexico
[2] Natl Inst Hlth, Natl Inst Psychiat Ramon Fuente Muniz, Mexico City, Mexico
[3] Mexican Federat Alzheimers Dis, Mexico City, Mexico
[4] Natl Inst Hlth, Natl Inst Geriatr, Res Dept, Perifer Sur 2767, Mexico City 14370, Mexico