to change the settings, and try to see if we can affect the appetite drive these patients have. >> larry: what have you learned so far? >> well, we've learned in the first few series, the first series we've done, that the procedure can be done safely. we've learned that we don't think we're having side effects. and that we can affect the urge to eat, decrease the urge. we're looking at it being well tolerated. but the real -- the jury's still out, larry, we don't have all the results yet. we're now working on trying to refine the settings to see if we can get the weight loss that we and the patients desire. >> larry: why only very obese people? >> well, this is the way the study was set up. it's patients who have failed all medical diets, patients who have failed gastric or stomach bypass surgery, patients who have undergone psychiatric evaluation. and again, their life expectancy is significantly reduced if they