2 Department of Interventional Neuroradiology and Neuroendovascularl Surgery, Miami Cardiac and Vascular Institute and Baptist Neuroscience Center, Miami, Florida, USA.
3 Department of Neurosurgery, University of Southern California, Los Angeles, California, USA.
4 Department of Neuroradiology, UT Southwestern, Dallas, Texas, USA.
5 UT Department of Neurosurgery/Semmes-Murphey Clinic, Memphis, Tennessee, USA.
6 Department of Neurological Surgery, Barrow Neurological Institute, Phoenix, Arizona, USA.