1. Department of Medicine; Surgery and Neuroscience; University of Siena; Siena Italy
2. Neurosciences Clinical Statistics GlaxoSmithKline; Uxbridge UK
3. Mango Solutions; Chippenham UK
4. Imperial College, Statistics Group; Department of Mathematics; London UK
5. Imperial College, Division of Brain Sciences; Department of Medicine; London UK
6. Clinical Imaging Centre GlaxoSmithKline; London UK