Hello Geert, My father is being evaluated for both Pallidotomy and Fetal Tissue Transplant. I was able to get some really good information on both from Carole Hilton at the Nuerosciences Institute in Los Angeles, California USA. If you wish to call the number is (213)977-2234 . I don't have the articles on hand but when I find them, will try to post them to the listserv. Hope that helps and best wishes. It's not an easy decision. My father is still unsure what to do. Sonia Lukich, 24 ([log in to unmask]) (P) Don Lukich - father 57