1 Departments of Rehabilitation and Regenerative Medicine and Neurology, Columbia University Medical Center, New York, NY, USA. Electronic address: [email protected].
2 Departments of Rehabilitation and Regenerative Medicine and Neurology, Columbia University Medical Center, New York, NY, USA.
3 Department of Paediatric Neurology, Catholic University, Rome, Italy.
4 Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health, London, UK.