1. 1Mansoura University Hospital, Mansoura-Dakhlia, Egypt;
2. 3Section of Neurosurgery, Dartmouth Hitchcock Medical Center, Lebanon, New Hampshire; and
3. 2Department of Neurosurgery, Brigham and Women's Hospital, Boston, Massachusetts;
4. 4Arkansas Neuroscience Institute, St. Vincent Infirmary Medical Center, Little Rock, Arkansas