1. Department of Neurosurgery, Sainte-Anne Military Hospital , Toulon Cedex 9 8800, France
2. Department of Visceral Surgery, Laveran Military Hospital , Marseille 13384, France
3. Department of Orthopedic surgery, Sainte-Anne Military Hospital , Toulon Cedex 9 8800, France
4. French Military Health Service Academy, École du Val-de-Grâce , Paris Cedex 5 75230, France