1. Division of Neurology, Department of Pediatrics, Arkansas Children’s Hospital, University of Arkansas for Medical Sciences, Little Rock, AR, USA
2. Department of Pathology, University of Iowa Carver College of Medicine and Senator Paul D. Wellstone Muscular Dystrophy Specialized Research Center, Iowa City, IA, USA
3. Departments of Pediatrics and Physical Medicine and Rehabilitation, Arkansas Children’s Hospital, University of Arkansas for Medical Sciences, Little Rock, AR, USA
4. Department of Pathology, University of Arkansas for Medical Sciences, Little Rock, AR, USA