- Correspondence to Dr Eleanor King, Institute of Neuroscience, Biomedical Research Building, Campus for Ageing and Vitality, Newcastle University, Newcastle upon Tyne NE4 5P, UK;
- Received 22 August 2017
- Revised 30 October 2017
- Accepted 31 October 2017
- Published in print 15 December 2017.
- Published online 16 December 2017.
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