Have you seen this site? http://www.valsalva.org/ I came across it last year and bought his book. I found it fascinating and very helpful. Dr. Perry's Valsalva Hypothesis is quite convincing. Check out the videos and other info. To be honest though, it is unlikely that there will ever be a 'cure' for stuttering since it's not a disease nor is it caused by a chemical imbalance of some kind.