Neil Coulson, PhD, is Associate Professor, Division of Rehabilitation & Ageing, School of Medicine, Queen's Medical Centre, University of Nottingham, NG7 2UH, the United Kingdom.
Correspondence to: Neil Coulson, PhD, Division of Rehabilitation & Ageing, School of Medicine, Queen's Medical Centre, University of Nottingham, NG7 2UH, United Kingdom ([email protected]).
The author declares no conflicts of interest.
Received April 03, 2013
Accepted December 31, 2013