1. Department of Neurosurgery, Tufts Medical Center, Boston, Massachusetts;
2. Department of Neurosurgery, Brigham and Women’s Hospital, Boston, Massachusetts;
3. Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts;
4. Department of Neurosurgery, Maine Medical Center, Portland, Maine;
5. Department of Neurosurgery, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire;
6. Department of Neurosurgery, University of Vermont Medical Center, Burlington, Vermont;
7. Department of Neurosurgery, UMass Memorial Medical Center, Worcester, Massachusetts;
8. Department of Neurosurgery, Yale New Haven Hospital, New Haven, Connecticut;
9. Department of Neurosurgery, Beth Israel Deaconess Medical Center, Boston, Massachusetts;
10. Department of Neurosurgery, Baystate Medical Center, Boston, Massachusetts;
11. Department of Neurosurgery, Rhode Island Hospital, Providence, Rhode Island;
12. Department of Neurosurgery, Boston Children’s Hospital, Boston, Massachusetts;
13. Department of Neurosurgery, Park Avenue Medical Center, Trumbull, Connecticut;
14. Department of Neurosurgery, Hartford Hospital, Hartford, Connecticut; and
15. Department of Neurosurgery, Lahey Hospital & Medical Center, Burlington, Massachusetts