This idea makes sense to me, I started out using date of first symptom, which in my case was very clear, the tremor started up just like someone had turned on a switch. But then I thought most PWP's were using date of diag, which in my case was one year later. I had thought of this myself but did not say anything about, so I am glad that Ivan brought it up. Lanier 63/2/1 Lanier Maddux 63/1 N4AG Chattanooga, (choo-choo town) Tenn. Home of Lookout Mountain and Rock City ([log in to unmask])