1. 1Department of EndocrinologyOxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, University of Oxford, Oxford, UK
2. 3Department of Experimental MedicineSapienza University of Rome, Rome, Italy
3. 2Department of NeuroradiologyJohn Radcliffe Hospital, University of Oxford, Oxford, UK
4. 4Department of Neurological SurgeryJohn Radcliffe Hospital, University of Oxford, Oxford, UK