Hello Cristina, I am writing this email to thank Dr. Clark and all of you. Finally I managed to do the urotac with contrast medium prescribed to me by the urologist and the result … the uric acid and oxalate stones are gone !!! So the only cure for my recurrence is to cleanse my kidneys once a year !!! If I had known before I would have avoided having operated 3 times kidney stones !!! Thanks to a client of mine, however, I discovered Dr. Clark’s treatments !! Now I have also recommended it to a client of mine who also has a kidney stone problem !!!