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Rotman Research Institute at the Baycrest Centre for Geriatric Care and Departments of Medicine and Psychology, University of Toronto, North York, Ontario, Canada Address for correspondence: Dr. T. W. Picton, Rotman Research Institute at Baycrest Centre, 3560 Bathurst Street, North York, M6A 2E1, Ontario, Canada.
Terence W. Picton (Wed,) studied this question.