1 Department of Neurological Surgery, Case Western Reserve University School of Medicine, and MetroHealth Medical Center, Cleveland, Ohio, USA.
2 Department of Neurological Surgery, Cleveland Clinic Foundation, Cleveland, Ohio, USA.
3 Department of Neurosurgery, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA.
4 Department of Neurological Surgery, Case Western Reserve University School of Medicine, and MetroHealth Medical Center, Cleveland, Ohio, USA. Electronic address: mkelly4@metrohealth.org.