1. School of Public HealthSydney Medical School, University of Sydney, Sydney, Australia
2. Center for Evaluation Research and SurveysNational Institute of Public Health, Cuernavaca, Morelos, Mexico
3. Laboratory of DementiasNational Institute of Neurology and Neurosurgery, Mexico DF, Mexico
4. Research Centre for Generational Health and Ageing, Faculty of Health, University of Newcastle, Newcastle, Australia
5. World Health Organization Study on global AGEing and adult health (SAGE)Geneva, Switzerland