1 a Division of Neurosurgery, Department of Clinical Neurosciences , Western General Hospital & University of Edinburgh , Edinburgh , UK.
2 b Division of Neurosurgery, Department of Clinical Neurosciences , Addenbrooke's Hospital & University of Cambridge , Cambridge , UK.
3 c Institute of Psychological Medicine and Clinical Neurosciences, National Neuroscience and Mental Health Research Institute, Cardiff University , Cardiff , UK.
4 d Department of Neurosurgery , The Walton Centre , Liverpool , UK.
5 e Department of Neurological Surgery , The John Radcliffe Hospital , Oxford , UK.
6 f Wessex Neurological Centre, University Hospital Southampton & University of Southampton , Southampton , UK.
7 g Department of Paediatric Neurosurgery , Alder Hey Children's Hospital , Liverpool , UK.
8 h Department of Microbiology , University Hospital Southampton , Southampton , UK.