ACKNOWLEDGMENTS
We thank the Qatar National Spina Bifida Clinic, Hamad Medical Corporation and WCM-Q, for invaluable efforts toward patient enrollment. We thank the California Department of Public Health Maternal Child and Adolescent Health Division for providing data. Findings and conclusions herein are those of the authors and do not necessarily represent the official position of the California Department of Public Health. The authors acknowledge the Texas Advanced Computing Center at The University of Texas at Austin for providing high-performance computing resources that have contributed to the research results reported within this paper. URL: http://www.tacc.utexas.edu .