Interview with Fabricio O. Lima, MD, MPH, author of Prognosis of Untreated Strokes Due to Anterior Circulation Proximal Intracranial Arterial Occlusions Detected by Use of Computed Tomography Angiography, and Randolph S. Marshall, MD, MS, author of Proximal Intracranial Arterial Occlusions: Does the Natural History Justify Further Interventional Trials?