Conception and design: all authors. Acquisition of data: Hariz, Pepper. Analysis and interpretation of data: all authors. Drafting the article: all authors. Critically revising the article: all authors. Reviewed submitted version of manuscript: all authors. Approved the final version of the manuscript on behalf of all authors: Hariz. Statistical analysis: Pepper. Administrative/technical/material support: Hariz, Zrinzo. Study supervision: Hariz, Zrinzo.
Portions of this work were presented in abstract form at the XXth biennial meeting of the European Society for Stereotactic and Functional Neurosurgery, in Cascais, Portugal, on September 28, 2012.
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