Colin Kirsch,Patrick Wintergalen,Steven P Cohen,Zaman Mirzadeh,S Harrison Farber,Brian G Wilhelmi

Creighton University School of Medicine, Phoenix, Arizona, USA.

Patrick Wintergalen

Creighton University School of Medicine, Phoenix, Arizona, USA.

Steven P Cohen

Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.

Zaman Mirzadeh

Department of Neurosurgery, Barrow Neurological Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona, USA [email protected].

S Harrison Farber

Department of Neurosurgery, Barrow Neurological Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona, USA.

Brian G Wilhelmi

Department of Neuroanesthesia, Barrow Neurological Institute, St Joseph's Hospital and Medical Center, Phoenix, Arizona, USA.