1. Laboratory for Neurobiology and Gene Therapy, Division of Molecular Medicine, Department of Molecular and Cellular Medicine, Katholieke Universiteit Leuven, 3000 Leuven, Flanders, Belgium.
2. Laboratory for Molecular Virology and Gene Therapy, Division of Molecular Medicine, Department of Molecular and Cellular Medici ne, Katholieke Universiteit Leuven, 3000 Leuven, Flanders, Belgium.
3. Gene Therapy Program, Division of Transfusion Medicine, Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104.
4. Laboratory for Molecular Virology and Gene Therapy, Division of Molecular Medicine, Department of Molecular and Cellular Medicine, Katholieke Universiteit Leuven, 3000 Leuven, Flanders, Belgium.
5. Department of Nuclear Medicine, University Hospital Leuven, Katholieke Universiteit Leuven, 3000 Leuven, Flanders, Belgium.