- Correspondence to Yu-Tzu Wu, REACH: The Centre for Research in Ageing and Cognitive Health, Department of Psychology, College of Life and Environmental Sciences, University of Exeter, Washington Singer Building, Perry Road, Exeter EX4 4QG, UK;
- Received 23 January 2017
- Revised 20 March 2017
- Accepted 12 May 2017
- Published online 8 August 2017.
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