1. From the Department of Nuclear Medicine (H.J.S., Jai-Hyuen Lee), Dankook University College of Medicine, Cheonan, Chung Nam; Department of Nuclear Medicine (J.S.K.), Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea; Department of Neurology (R.J.B., J.J.L.-G., J.C.M., A.D.), Washington University School of Medicine, St. Louis, MO; Department of Clinical Epidemiology and Biostatistics (S.K.), Asan Medical Center, University of Ulsan College of Medicine, Seoul, South...