1. From the Department of Radiology and Division of Endocrinology, Children's Hospital of Los Angeles (V.G., T.F.R., S.M., G.C.); the University of Southern California School of Medicine, Los Angeles (V.G., T.F.R., S.M., G.C.); the Medical and Research Services. Sepulveda Veterans Affairs Medical Center, Sepulveda, Calif. (W.G.G.); and the UCLA School of Medicine-San Fernando Valley Program, Los Angeles (W.G.G.). Address reprint requests to Dr. Gilsanz at the Department of Radiology, Children's Hospital of...