Submitted for Publication: October 23, 2013; final revision received May 5, 2014; accepted May 30, 2014.
Published Online: August 14, 2014. doi:10.1001/jamaoto.2014.1515.
Study concept and design: Cardona.
Acquisition, analysis, or interpretation of data: Daniel, Cardona.
Drafting of the manuscript: Cardona.
Critical revision of the manuscript for important intellectual content: Daniel.
Administrative, technical, and material support: Daniel, Cardona.
Study supervision: Daniel.
Conflict of Interest Disclosures: None reported.
Previous Presentation: This research was presented at the Canadian Paediatric Society 91st Annual Conference; June 26, 2014; Montreal, Quebec, Canada.
Additional Contributions: The onabotulinum toxin A used in this study was provided by our hospital pharmacy and not by any pharmaceutical company.