Anne C. Skeldon - UK Dementia Research Institute, Care Research & Technology Centre, Imperial College London, London and University of Surrey, Guildford, United Kingdom
Imran M. Usmani - School of Mathematics & Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, United Kingdom
Derk Jan Dijk - Surrey Sleep Research Centre, School of Biosciences, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom