1. Charing Cross Hospital; Neuromuscular Unit 3 North; Fulham Palace Road London UK W6 8RF
2. National Hospital for Neurology and Neurosurgery; MRC Centre for Neuromuscular Diseases; PO Box 114 Queen Square London UK WC1N 3BG
3. King's College Hospital; Department of Neurology; Denmark Hill London UK SE5 9RS