1. Federal University of Rio Grande do Norte/Faculty of Health Sciences of Trairi - UFRN/FACISA, Health of Children, Santa Cruz, Brazil
2. Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA, US
3. National Center for Medical Rehabilitation Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA
4. Functional and Applied Biomechanics Section, Rehabilitation Medicine Department, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA