1. Departments of Pediatrics (Y.H.C., H.Y.P., K.H.P., E.K.K., D.K.J.), Nuclear Medicine (K.H.L.), Seoul;
2. Department of Nuclear Medicine, Seoul National University College of Medicine (S.E.K.), Seoul;
3. Pathology (S.Y.S.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul;
4. Clinical Research Center, Samsung Biomedical Research Institute (Y.J.O., A.H.K., J.S.K., C.W.K., S.H.C.), Seoul 135-710, Korea