Conception and design: Meckel. Acquisition of data: Meckel, Spittau, El-Sherifi, Hader, Singh, Motschall, Urbach. Analysis and interpretation of data: Meckel, Spittau. Drafting the article: Meckel, Spittau, San Millán, El-Sherifi. 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: Meckel. Statistical analysis: Vach. Administrative/technical/material support: Motschall. Study supervision: Meckel. Anatomical figure design: Spittau. Anatomical review: San Millán.
Parts of this work were presented at the 12th Congress of World Federation of Interventional and Therapeutic Neuroradiology (WFITN) held in Buenos Aires, Argentina, on November 10, 2013, and at the 37th European Society of Neuroradiology Annual Meeting held in Frankfurt, Germany, on September 29, 2013.