Aesthetic Outcome in Patients after Polymethyl-Methacrylate (PMMA) Cranioplasty: A Questionnaire-Based Single Center Study - Fischer, C. M.; Burkhardt, J.-K.; Sarnthein, J.; Bernays, R.-L.; Bozinov, O. (Journal of Neurological Surgery Part A: Central European Neurosurgery, 2012)