1. School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham, England2Department of Neurology, Sandwell and West Birmingham Hospitals NHS Trust, City Hospital, Birmingham, England
2. Birmingham Clinical Trials Unit, College of Medical and Dental Sciences, University of Birmingham, Birmingham, England
3. Cancer Research UK Clinical Trials Unit, College of Medical and Dental Sciences, University of Birmingham, Birmingham, England
4. University of Nottingham, Nottingham, England
5. King’s College, London, England