1. School of Medical Sciences; Bangor University; Bangor United Kingdom
2. Department of Care of the Elderly; Betsi Cadwaladr University Health Board, Llandudno Hospital; Conwy United Kingdom
3. Institute of Gerontology and Center for Neuropsychological Diagnostics and Intervention; University of Vechta; Vechta Germany
4. Department of Neurology; University Hospital Cologne; Cologne Germany
5. School of Psychology; Bangor University; Bangor United Kingdom