1 Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA; Feinberg School of Medicine, Northwestern University, Chicago IL, USA; School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK; Lee Kong Chian School of Medicine, Imperial College London and Nanyang Technology University, Singapore; Agency for Science, Technology and Research, Singapore.
2 Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA. Electronic address: basil.darras@childrens.harvard.edu.