Authors: John Brandsema, MD. Neuromuscular Section Head, Children's Hospital of Philadelphia, Philadelphia, PA, USA

Diana Castro, MD. Co-Director, Muscular Dystrophy Association Clinic, UT Southwestern Medical Center, Dallas, TX, USA

Authors: Claudia A. Chiriboga, MD, MPH, FAAN, Columbia University Medical Center, New York, NY, USA.

Julie A. Parsons, MD, Children's Hospital Colorado, Aurora, CO, USA

Richard S. Finkel, MD, Nemours Children's Hospital, Orlando, FL, USA

Authors: David F. McDermott, MD. Professor of Medicine, Dana-Farber/Harvard Cancer Center, Boston, MA, USA

Lauren C. Harshman, MD. Assistant Professor of Medicine, Dana-Farber/Harvard Cancer Center, Boston, MA, USA

Authors: Dr. Basil Darras, Director of the Neuromuscular Center, Boston Children's Hospital, Boston, MA

Dr. John Brandsema, Neuromuscular Section Head, Children's Hospital of Philadelphia, Philadelphia, PA