1. University of Milan; Department of Neurology; Istituto Policlinico San Donato San Donato Milanese Milan Italy 20097
2. University of Groningen; Department of Endocrinology; PO Box 30.001 Groningen Netherlands 9700 RB
3. Policlinico San Donato Milanese; Department of Neurology; Milan Italy
4. King's College Hospital; Department of Neurology; Academic Neuroscience Centre Denmark Hill London UK SE5 9RS