1. Department of Neuroscience, Brighton and Sussex Medical School University of Sussex Falmer UK
2. Research and Development Sussex Partnership NHS Foundation Trust Sussex UK
3. Autonomic Unit National Hospital for Neurology and Neurosurgery London UK
4. UCL Queen Square Institute of Neurology, Faculty of Brain Sciences University College London London UK
5. Neurovascular Medicine (Pickering Unit) St Mary's Hospital, Imperial College London London UK