1. Department of Neurosurgery, Purpan University Hospital, Toulouse, France
2. Université Paul-Sabatier, Toulouse, France
3. Department of Neurosurgery, Rennes University Hospital, Rennes, France
4. Department of Neurosurgery, Centres Hospitalo-universitaires, Clermont Ferrand, France
5. Harrison Medical Center, Bremerton, Washington
6. Department of Neuroanesthesiology, Pellegrin University Hospital, Bordeaux, France
7. Department of Neurosurgery, Rangueil University Hospital, Toulouse, France
8. Department of Neurosurgery, Pellegrin University Hospital, and Université Victor Segalen Bordeaux 2, Bordeaux, France