1. Department of Neurosurgery, Campinas State University, Campinas, (SP), Brazil
2. Department of Neurosurgery, University of Virginia, Charlottesville, Virginia
3. Department of Medicine, Division of Endocrinology, Johns Hopkins University, Baltimore, Maryland
4. Department of Neurosurgery and Oncology, Brain Tumor Stem Cell Laboratory and Neurosurgical Outcomes Laboratory, The Johns Hopkins University, Baltimore, Maryland