- Correspondence to Professor Michael Swash, Barts and the London School of Medicine, QMUL at the Royal London Hospital, London UK and Institute of Neuroscience, University of Lisbon, Lisbon, Portugal;
- Received 1 February 2017
- Revised 9 April 2017
- Accepted 13 April 2017
- Published online 13 May 2017.
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