My father requested & received a very nice brochure from Peidmont Hospital. I'm not going to give an opinion on the content as I don't have that expertise. The front of the brochure has the words, in not so clear print, GAMMA KNIFE - The Gammaa Knife: Safe, Precise, Powerful, Cost Effective Surgery Without an Incision. On the back is the address & 1-800-848-7781 www.piedmonthospital.org Bonnie daughter of Jim 77/3