1. Department of Internal Medicine (J.H.M., S.H.C., S.L., H.C.J.), Seongnam 463-707, Korea
2. Department of Internal Medicine (Y.J.P., D.J.P.), Seoul National University Hospital, Seoul National University College of Medicine, Seoul 110-799, Korea
3. Neuropsychiatry (T.H.K., J.W.H., K.W.K.), Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam 463-707, Korea