[1] Univ Erlangen Nurnberg, Klin & Poliklin Mund Kiefer Gesichtschirurg, Dept Oral & Craniomaxillofacial Surg, Erlangen, Germany
[2] Univ Erlangen Nurnberg, Dept Neurosurg, Erlangen, Germany
[3] Univ Gottingen, Dept Oral & Craniomaxillofacial Surg, D-3400 Gottingen, Germany
[4] Univ Erlangen Nurnberg, Dept Neuropediatry, Erlangen, Germany