- Resting regional cerebral glucose metabolism in advanced Parkinson's disease studied in the off and on conditions with [(18)F]FDG-PET. Berding, G., Odin, P., Brooks, D.J., Nikkhah, G., Matthies, C., Peschel, T., Shing, M., Kolbe, H., van Den Hoff, J., Fricke, H., Dengler, R., Samii, M., Knapp, W.H. Mov. Disord. (2001)