1. From the Turku PET Centre/University of Turku (M.B., A.S., S.K., H.T.S., M.T., J.K., and P.I.), Turku, Finland; the Institute of Clinical Physiology/National Research Council (M.B. and P.I.), Pisa, Italy; the Department of Medicine/University of Turku (E.J., A.S., H.U., M.P., and K.E.J.A.), Turku, Finland; and the Department of Clinical Physiology and Nuclear Medicine/University of Turku (M.S., M.M., and J.H.), Turku, Finland.