1. Section of Endocrine Surgery (M.W.Y., P.H.G.I., S.N., A.H.), UCLA David Geffen School of Medicine, Los Angeles, California 90095
2. Department of Research and Evaluation (H.C.Z., I.-L.A.L., A.L.A.), Kaiser Permanente Southern California, Pasadena, California 91101
3. Department of Surgery (P.I.H.), Kaiser Permanente Los Angeles Medical Center, Los Angeles, California 90027