[1] Univ Vienna, Neurol Klin, A-1090 Vienna, Austria
[2] Univ Bonn, Klin Epileptol, D-5300 Bonn, Germany
[3] Univ Essex, Neurol Klin, Essen, Germany
[4] Krankenstalten Gilead, Neurochirurg Klin, Bielefeld, Germany
[5] Univ Greifswald, Klin Neurol & Psychiat, Greifswald, Germany
[6] Univ Bonn, Neurochirurg Klin, D-5300 Bonn, Germany
[7] Univ Erlangen Nurnberg, Neurol Klin & Poliklin, Erlangen, Germany
[8] Univ Gottingen, Abt Klin Neurophysiol, D-3400 Gottingen, Germany
[9] Univ Spital Zurich, Neurol Klin & Poliklin, Zurich, Switzerland
[10] Univ Freiburg, Neurochirurg Klin, Freiburg, Germany