1. From the Neural Stem Cell Laboratory in Clinical Research Institute (A.-K.C., K.-H.J., S.-T.L., H.-K.P., D.-I.S., J.-M.K., D.-H.K., J.-H.K., S.-J.K., E.-C.S., M.K., S.K.L., J.-K.R.), Stem Cell Research Center, Department of Neurology, Seoul National University Hospital, Program in Neuroscience, Neuroscience Research Institute of SNUMRC, Seoul National University, Seoul, Korea; the Division of Epidemic Intelligence Service (K.-H.J.), Korea Center for Disease Control & Prevention, Seoul, Korea;...