1. Veterans Affairs Palo Alto Health Care System (F.B.K., S.A.), Palo Alto, California 94304
2. Department of Medicine (F.B.K., W.-J.S., K.H., S.P.), Stanford University, Stanford, California 94305
3. Department of Metabolic Disease (J.-i.O.), University of Tokyo, Tokyo 113, Japan
4. Department of Internal Medicine (S.I.), Jichi Medical School, Tochigi 329-0498, Japan