I asked where because I thought it would be in Ca and at ucla. The person I was suggesting these was Dr Carden he is in Marina Del Ray and I know that him and Prager do a lot with these. If you google Carden you will get a lot of info on these blocks and rsd. I don't have a lot of the things that go with rsd other then the severe pain but they are still treating me like I have rsd and no meds have helped me either. When you have a lot of unknown in your test results and are in high pain I was told you can have rsd and not have all the symptoms and also when there is not an exact reason like diabetes etc. If you want you can email me and I will talk more about my experience with Carden.