1. Department of Haematology; Glasgow Royal Infirmary; Glasgow; UK
2. Department of Neurology; Institute of Neurological Sciences; Glasgow; UK
3. Department of Neuroradiology; Institute of Neurological Sciences; Glasgow; UK
4. Scottish Trace Element and Micronutrient Reference Laboratory; Glasgow Royal Infirmary; Glasgow; UK
5. Department of Neurology; Ninewells Hospital; Dundee; UK