aBrain Institute, Nicklaus Children's hospital

bDepartment of Neurosurgery, Jackson Memorial Hospital, University of Miami Miller School of Medicine, Miami

cThe Miami Project to Cure Paralysis, Miller School of Medicine, Miami, Florida, USA

Correspondence to Guilherme Santos Piedade, MD, PhD, Brain Institute, Nicklaus Children's hospital, 3100 SW 62nd Avenue, Miami, FL 33155, USA. Tel: +1 305 662 8386; fax: +1 305 662 8490; e-mail: [email protected]