1. National Institute of Geriatrícs; Mexico City Mexico
2. Geriatrics Clinic; Memory Clinic; National Institute of medical Science and Nutrition Salvador Zubirán; Mexico City Mexico
3. Coordination of High Specialty Medical Units; Clinical Excellence Department; Mexican Institute of Social Security; Mexico City Mexico
4. Epidemiological and Health Research Unit; Aging Division; National Medical Center Centiry XXI; Mexican Institute of Social Security; Mexico City Mexico
5. The National Institute of Neurology and Neurosurgery“Manuel Velazco Suarez”; Faculty of Medicine of the National Autonomous Universitu of Mexico; Mexico City Mexico