1. School of Medicine, University of Texas at San Antonio, Texas;
2. School of Medicine, Case Western Reserve University, Cleveland, Ohio;
3. Department of Neurosurgery, University Hospitals Cleveland Medical Center, Cleveland, Ohio;
4. Department of Neurosurgery, Vanderbilt University Medical Center, Nashville, Tennessee;
5. Department of Neurosurgery, UT Health San Antonio, Texas; and
6. Department of Neurosurgery, Rochester Regional Health and University of Rochester Medical Center, Rochester, New York