Debbie, I thought I had signed on to NIH site, but had an email stating they did not receive my confirmation. Will have to try again tonight or tomorrow. It is National Institute of Health in Washington, DC. NIH has other sites with PD info also. Thank you for note and will try to assist you in finding information. Rilla ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn