For anybody interested in STN DBS you can get more information than you ever wanted to know by reading the following FDA conference which resulted in the approval of STN DBS for general use. http://www.fda.gov/ohrms/dockets/ac/00/transcripts/3606t1.rtf It is long- I stated to skip large parts after reading much of the first 100 pages- It is probably 300 pages long so don't print it unless you are looking for a long - sometimes boring read and you have a couple reams of paper to spare. Charlie