Hi Pennie and Terry, Welcome to the List, Is it possible that you could be more specific about the suspected cause of Terry's PD? I am generally interested in efforts to pinpoint the cause. I myself have a strong suspicion of Carbonmonoxide as a cause, but would like to look at any other cause. BTW, My son ( no PD ) was stationed for quite an extended stay in the Air Force, on Okinawa. Greetings, Will A. Kuipers Dallas, TX 78 / 71 <[log in to unmask]>