- Correspondence to Dr Manjit Singh Matharu, Headache Group, Institute of Neurology and The National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK;
- Received September 15, 2018
- Revised November 16, 2018
- Accepted December 5, 2018
- First published February 1, 2019.
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