1. Laboratory of Dementias National Institute of Neurology and Neurosurgery Mexico City Mexico
2. Departament of Epidemiologic and Psychosocial Research National Institute of Psychiatry Ramon de la Fuente Muniz Mexico City Mexico
3. Department of Pharmacology, School of Medicine National Autonomous University of Mexico Mexico City Mexico
4. Department of Health Service and Population Research King's College London (Institute of Psychiatry) London UK