1. The University of Sydney, Sydney Children's Hospitals Network (Randwick and Westmead; Sydney New South Wales Australia
2. Paediatrics and Child Health; University of Sydney; Sydney New South Wales Australia
3. Carver College of Medicine, Department of Pediatrics; University of Iowa; Iowa City IA
4. IRCCS Foundation, Carlo Besta Neurological Institute; Milan Italy
5. Neuromuscular Program, The Children's Hospital of Philadelphia; Philadelphia PA
6. Division of Neurology, The Children's Hospital of Philadelphia, Department of Neurology, Perelman School of Medicine; University of Pennsylvania; Philadelphia PA
7. UCL Institute of Child Health & Great Ormond Street Hospital; London United Kingdom
8. MRC Centre for Neuromuscular Diseases, UCL Institute of Neurology; London United Kingdom
9. Neuromuscular Program, Division of Neurology, Nemours Children's Hospital; Orlando FL
10. Department of Neurology; University of Rochester; Rochester NY
11. Carver College of Medicine, Department of Neurology; University of Iowa; Iowa City IA