1. Department of Neurosurgery, Christus Spohn Hospital, Corpus Christi, Texas, United States
2. Department of Neurosurgery, CHI Health St. Francis, Grand Island, Nebraska, United States
3. Department of Neurosurgery, National Brain Aneurysm and Tumor Center, Minneapolis, Minnesota, United States
4. Department of Research, International Consortium of Neurological Research, United States