1. Department of Obstetrics and Gynaecology, Children Health Research Institute, University of Western Ontario, London, Canada, , Department of Neurology, Friedrich Schiller University, D-07740 Jena, Germany
2. Institute of Laboratory Animal Science, Friedrich Schiller University, D-07740 Jena, Germany
3. Department of Neurology, Friedrich Schiller University, D-07740 Jena, Germany
4. Institute of Medical Statistics, Computer Sciences and Documentation, Friedrich Schiller University, D-07740 Jena, Germany