1. Division of Surgical Research & Gene Therapy Center, Lausanne University Medical School, 1011 Lausanne, Switzerland.
2. CytoTherapeutics Inc., Providence, RI 02906, USA.
3. Department of Pharmacology and Division of Clinical Neuromuscular Research, Centre Medical Universitaire, 1211 Geneva 4, Switzerland.
4. Department of Neurology, Lausanne University Medical School, 1011 Lausanne, Switzerland.
5. Department of Neurosurgery, Lausanne University Medical School, 1011 Lausanne, Switzerland.