1. Department of Neurosurgery, Università degli Studi di Napoli Federico II, Naples, Italy
2. Naples, Italy
3. Rome, Italy
4. Creteil, Paris, France
5. Los Angeles, California
6. Cagliari, Italy
7. Nijmegen, The Netherlands
8. Treviso, Italy
9. Bologna, Italy
10. Tokyo, Japan
11. Phoenix, Arizona
12. Greifswald, Germany
13. New York, New York
14. Sydney, Australia
15. Wilmington, Delaware
16. Sao Paulo, Brazil