1. Department of Geriatrics; Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán; Mexico City Mexico
2. Bordeaux Population Health Research Center, UMR 1219; Univ. Bordeaux, Inserm; Bordeaux France
3. Department of Infectious Diseases; Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán; Mexico City Mexico
4. Department of Geriatrics; Hospital Civil de Guadalajara Fray Antonio Alcalde; Guadalajara Mexico