Conception and design: Yang, Park. Acquisition of data: Yang, Franz, Bentley, Yee, Chang, Kendall-Thomas. Analysis and interpretation of data: Yang, Franz, Bentley, Yee, Chang, Kendall-Thomas. Drafting the article: Yang, Franz, Bentley, Yee, Chang, Kendall-Thomas. Critically revising the article: Yang, Park. Reviewed submitted version of manuscript: all authors. Approved the final version of the manuscript on behalf of all authors: Yang. Study supervision: Yang, Kendall-Thomas, Park.
Portions of this work were presented on March 7, 2014, as an oral platform at the Annual AANS/CNS Meeting, Section on Disorders of the Spine and Peripheral Nerves, in Orlando, Florida.