1. From Brown University, Providence, RI (I.M.A.); Departments of Neurosurgery (D.-H.P.) and Preventive Medicine (I.M.A., H.J.K., H.S.A.), College of Medicine, Korea University, Seoul, Korea; Medical Research Institute, College of Medicine, Ewha Womans University, Seoul, Korea (H.J.H.); and Department of Public Health, Graduate School, Korea University, Seoul, Korea (K.H.K.).